{
  "generated_at": "2026-08-27T20:02:41.345Z",
  "disclaimer": "Scores are editorial and derived from product reviews, published warranty terms and moderated user reports.",
  "brands": [
    {
      "id": "63ff76db-a6ab-42de-8e7b-4357397b8842",
      "slug": "cobb-tuning",
      "name": "COBB Tuning",
      "website": "https://www.cobbtuning.com",
      "country": "USA",
      "category": "Tuning & engine management",
      "founded_year": 1999,
      "tagline": "Accessport ecosystem and staged packages",
      "summary": "Best known for the Accessport handheld tuner and staged power packages built around a supported calibration ecosystem.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited warranty on electronics; registration required.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.8,
          "weight": 0.2,
          "rationale": "Consistent hardware quality across the Accessport ecosystem.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.9,
          "weight": 0.2,
          "rationale": "Staged packages are validated as complete systems.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.5,
          "weight": 0.2,
          "rationale": "Long service life reported on tuner hardware and intake components.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8.7,
          "weight": 0.2,
          "rationale": "Responsive support and an active calibration release cadence.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 9.2,
          "weight": 0.2,
          "rationale": "Thorough install and calibration documentation.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "27 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.6
    },
    {
      "id": "0ecf8126-51e1-4b9b-8ed4-6324689e72d7",
      "slug": "act",
      "name": "ACT (Advanced Clutch Technology)",
      "website": "https://www.advancedclutch.com",
      "country": "USA",
      "category": "Drivetrain",
      "founded_year": 1994,
      "tagline": "Clutch and flywheel packages",
      "summary": "Clutch and flywheel manufacturer with staged Subaru offerings from street to competition use.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited warranty on manufacturing defects.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.6,
          "weight": 0.2,
          "rationale": "Consistent clutch and flywheel manufacturing quality.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.7,
          "weight": 0.2,
          "rationale": "Clear stage-to-application mapping.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.5,
          "weight": 0.2,
          "rationale": "Holds up well when matched correctly to power and use case.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8,
          "weight": 0.2,
          "rationale": "Defect warranty; wear and install error are excluded.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.2,
          "weight": 0.2,
          "rationale": "Good torque and break-in documentation.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "32 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.5
    },
    {
      "id": "1b5b8741-e866-4871-9fed-6a37b3bc29dd",
      "slug": "whiteline",
      "name": "Whiteline",
      "website": "https://www.whiteline.com.au",
      "country": "Australia",
      "category": "Suspension & chassis",
      "founded_year": 1992,
      "tagline": "Bushings, sway bars and chassis control",
      "summary": "Suspension and chassis manufacturer with an extensive Subaru application list for bars, bushings and alignment hardware.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited lifetime warranty on many components.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.5,
          "weight": 0.2,
          "rationale": "Consistent bar and bushing quality with good coatings.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.6,
          "weight": 0.2,
          "rationale": "Extensive verified application list across Subaru chassis.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.4,
          "weight": 0.2,
          "rationale": "Bushings and bars hold up well in street and track use.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8.3,
          "weight": 0.2,
          "rationale": "Limited lifetime warranty on many components.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.4,
          "weight": 0.2,
          "rationale": "Application guides and install sheets widely available.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "34 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.5
    },
    {
      "id": "7fd97f5c-fe8e-4325-863f-6b0e4eebcc66",
      "slug": "grimmspeed",
      "name": "GrimmSpeed",
      "website": "https://www.grimmspeed.com",
      "country": "USA",
      "category": "Bolt-on performance",
      "founded_year": 2006,
      "tagline": "Engineering-forward bolt-ons",
      "summary": "Subaru-focused engineering shop producing intercoolers, top-mount kits, pulleys and driveability parts with documented testing.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Lifetime warranty on many hard parts.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 9,
          "weight": 0.2,
          "rationale": "Well-finished welds and hardware across intercooler and top-mount kits.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 9.1,
          "weight": 0.2,
          "rationale": "Fitment is a consistent strength; hardware kits are complete.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.8,
          "weight": 0.2,
          "rationale": "Few long-term failure reports on core hard parts.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8.9,
          "weight": 0.2,
          "rationale": "Lifetime warranty on many hard parts with direct support.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.7,
          "weight": 0.2,
          "rationale": "Clear instructions with torque specs and testing data.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 9,
          "weight": 0.75,
          "rationale": "20 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.4
    },
    {
      "id": "dd0c0643-ed69-449b-8d91-7470d533873c",
      "slug": "tomei",
      "name": "Tomei Powered",
      "website": "https://www.tomeiusa.com",
      "country": "Japan",
      "category": "Engine & exhaust",
      "founded_year": 1968,
      "tagline": "JDM engineering heritage",
      "summary": "Japanese motorsport manufacturer producing camshafts, valvetrain, exhausts and engine components with a motorsport lineage.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Manufacturer defect warranty via distributor.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.7,
          "weight": 0.2,
          "rationale": "High-quality materials and finishing consistent with motorsport heritage.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.3,
          "weight": 0.2,
          "rationale": "Fitment is good; some parts assume JDM-market variants.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.6,
          "weight": 0.2,
          "rationale": "Long track record on valvetrain and exhaust components.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 7.6,
          "weight": 0.2,
          "rationale": "Support runs through regional distributors.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 7.7,
          "weight": 0.2,
          "rationale": "Documentation is accurate but sparse in English.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "58 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.4
    },
    {
      "id": "3ee9b5e0-23fc-410f-b4cb-7e1fae223421",
      "slug": "iag-performance",
      "name": "IAG Performance",
      "website": "https://www.iagperformance.com",
      "country": "USA",
      "category": "Engine internals & built motors",
      "founded_year": 2006,
      "tagline": "Built short blocks and oiling solutions",
      "summary": "Engine builder and parts manufacturer focused on EJ and FA short blocks, oiling system upgrades and race-oriented hardware.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Warranty varies by engine package tier.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 9,
          "weight": 0.2,
          "rationale": "Machining and assembly quality respected in built-motor circles.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.6,
          "weight": 0.2,
          "rationale": "Engine packages are spec-driven; supporting mods must match the tier.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.8,
          "weight": 0.2,
          "rationale": "Strong reputation on oiling and short block durability at power.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8.2,
          "weight": 0.2,
          "rationale": "Warranty terms are tier-dependent and require documented tuning.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.5,
          "weight": 0.2,
          "rationale": "Detailed build sheets and supporting-mod requirements published.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 9,
          "weight": 0.75,
          "rationale": "20 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.3
    },
    {
      "id": "02df8e8d-0f1b-4481-89a0-4ea5f1a84bc2",
      "slug": "killer-b-motorsport",
      "name": "Killer B Motorsport",
      "website": "https://www.killerbmotorsport.com",
      "country": "USA",
      "category": "Oiling & engine hardware",
      "founded_year": 2008,
      "tagline": "Oil pickups, pans and holy headers",
      "summary": "Specialist manufacturer of Subaru oiling components and equal-length headers, popular in high-power builds.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited warranty on manufacturing defects.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.9,
          "weight": 0.2,
          "rationale": "Fabrication quality on pickups, pans and headers is consistently praised.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.4,
          "weight": 0.2,
          "rationale": "Header fitment can require chassis-specific attention.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 9,
          "weight": 0.2,
          "rationale": "Designed for sustained high-power and track use.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8,
          "weight": 0.2,
          "rationale": "Small-manufacturer support; defect claims handled directly.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 10,
          "weight": 1.5,
          "rationale": "No approved community issue reports on file.",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 7.8,
          "weight": 0.2,
          "rationale": "Instructions are functional but less polished than larger brands.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 8.6,
          "weight": 0.75,
          "rationale": "18 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 9.2
    },
    {
      "id": "681023b0-bc31-4d7a-839d-b6ca7ef23c77",
      "slug": "perrin-performance",
      "name": "PERRIN Performance",
      "website": "https://www.perrinperformance.com",
      "country": "USA",
      "category": "Bolt-on performance",
      "founded_year": 1998,
      "tagline": "Broad Subaru bolt-on catalog",
      "summary": "Wide catalog of Subaru bolt-ons from intakes to suspension links, with consistent fitment documentation.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited lifetime warranty on most parts.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.3,
          "weight": 0.2,
          "rationale": "Solid finish quality across a very broad catalog.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.4,
          "weight": 0.2,
          "rationale": "Good application coverage; occasional clearance notes on older chassis.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.2,
          "weight": 0.2,
          "rationale": "Well-regarded on suspension links and chassis parts.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 8.3,
          "weight": 0.2,
          "rationale": "Limited lifetime warranty on most parts.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 8.5,
          "weight": 1.5,
          "rationale": "1 approved community issue report(s).",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.1,
          "weight": 0.2,
          "rationale": "Instructions available for most SKUs.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "28 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 8.8
    },
    {
      "id": "40cd85db-635e-48d6-acf5-d40890ed40b6",
      "slug": "mishimoto",
      "name": "Mishimoto",
      "website": "https://www.mishimoto.com",
      "country": "USA",
      "category": "Cooling",
      "founded_year": 2005,
      "tagline": "Cooling with lifetime warranty",
      "summary": "Cooling specialist producing radiators, oil coolers and intercoolers, with an unusually strong warranty position.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Lifetime warranty on most cooling products.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 8.4,
          "weight": 0.2,
          "rationale": "Good construction on radiators, oil coolers and hoses.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 8.5,
          "weight": 0.2,
          "rationale": "Direct-fit claims generally hold up on supported chassis.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 8.2,
          "weight": 0.2,
          "rationale": "Reliable in street use; heavy track duty is more variable.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 9.1,
          "weight": 0.2,
          "rationale": "Lifetime warranty and a well-run claims process.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 8.5,
          "weight": 1.5,
          "rationale": "1 approved community issue report(s).",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 8.6,
          "weight": 0.2,
          "rationale": "Thorough install guides with photos.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 9.2,
          "weight": 0.75,
          "rationale": "21 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 8.7
    },
    {
      "id": "0371fc32-7999-43d6-bfc5-cfe86b35944b",
      "slug": "invidia",
      "name": "Invidia",
      "website": "https://www.invidiausa.com",
      "country": "Taiwan",
      "category": "Exhaust",
      "founded_year": 1996,
      "tagline": "Volume exhaust manufacturer",
      "summary": "High-volume exhaust manufacturer with a long-standing Subaru presence across catback and downpipe categories.",
      "ai_summary": null,
      "ai_summary_updated_at": null,
      "warranty_terms": "Limited warranty against defects.",
      "verified": false,
      "warranty_months": null,
      "warranty_type": null,
      "made_in_usa": null,
      "country_of_manufacture": null,
      "ownership_type": null,
      "years_in_business": null,
      "review_avg": 0,
      "review_count": 0,
      "product_count": 0,
      "quality_score": null,
      "components": [
        {
          "category": "Build Quality",
          "score": 7.6,
          "weight": 0.2,
          "rationale": "Volume manufacturing; finish quality varies between product lines.",
          "sort_order": 1
        },
        {
          "category": "Fitment Accuracy",
          "score": 7.4,
          "weight": 0.2,
          "rationale": "Occasional hanger and alignment adjustments reported on install.",
          "sort_order": 2
        },
        {
          "category": "Durability",
          "score": 7.5,
          "weight": 0.2,
          "rationale": "Generally durable; some reports of rattles at higher mileage.",
          "sort_order": 3
        },
        {
          "category": "Support & Warranty",
          "score": 7,
          "weight": 0.2,
          "rationale": "Warranty handled through distributors, which slows resolution.",
          "sort_order": 4
        },
        {
          "category": "Reported issues",
          "score": 8.5,
          "weight": 1.5,
          "rationale": "1 approved community issue report(s).",
          "sort_order": 4
        },
        {
          "category": "Documentation",
          "score": 7,
          "weight": 0.2,
          "rationale": "Basic instructions; limited platform-specific guidance.",
          "sort_order": 5
        },
        {
          "category": "Longevity",
          "score": 10,
          "weight": 0.75,
          "rationale": "30 years in the industry.",
          "sort_order": 8
        }
      ],
      "overall": 8.5
    }
  ]
}