{"product_id":"exedy-flywheel-2004-2021-subaru-wrx-sti","title":"EXEDY Flywheel – 2004–2021 Subaru WRX STI","description":"\u003cp\u003eThe \u003cstrong\u003eEXEDY Flywheel – 2004–2021 Subaru WRX STI\u003c\/strong\u003e is a focused driveline solution for 2004–2021 Subaru WRX STI, aimed at owners who want enthusiast street, autocross, HPDE, and modified performance builds without piecing together mismatched clutch components.\u003c\/p\u003e\u003ch3\u003eManufacturer Background\u003c\/h3\u003e\u003cp\u003eSince 1923, EXEDY has developed clutch and powertrain components for OEM and performance use around the world. The company's Daikin Clutch heritage and motorsports engineering experience underpin a catalog that ranges from OE replacement hydraulics and clutch kits to SFI-certified sport clutches, chromoly flywheels, and Hyper multi-plate assemblies.\u003c\/p\u003e\u003ch3\u003ePurpose \u0026amp; Application\u003c\/h3\u003e\u003cp\u003eEXEDY flywheels are engineered as matched driveline components rather than cosmetic weight reductions. Its lightweight performance flywheels use one-piece billet or forged chromoly steel construction to reduce rotational inertia while retaining high thermal capacity and integrated ring-gear strength.\u003c\/p\u003e\u003cp\u003eA lighter flywheel can improve engine response and rev matching, but it can also reduce stored rotational energy and make low-speed takeoff more sensitive. It is best suited to drivers who value throttle response, faster transient behavior, and performance use over maximum factory-like smoothness.\u003c\/p\u003e\u003ch3\u003eConfiguration\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEXEDY Part Number:\u003c\/strong\u003e FJF505\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Application-Specific Flywheel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction \/ Character:\u003c\/strong\u003e EXEDY application-specific flywheel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque Rating:\u003c\/strong\u003e Not rated independently as a clutch torque-capacity figure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest Suited For:\u003c\/strong\u003e Clutch service or performance builds requiring the listed EXEDY flywheel fitment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplication Recommendation\u003c\/h3\u003e\u003cp\u003eFor 2004–2021 Subaru WRX STI, this configuration makes the most sense when its intended duty matches the vehicle's actual power and use. Avoid overspecifying clutch aggressiveness: the best setup is the one that maintains the needed torque reserve while preserving usable modulation and protecting the rest of the driveline.\u003c\/p\u003e\u003ch3\u003eTechnical Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e One-piece billet or forged chromoly steel on EXEDY lightweight performance flywheels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Goal:\u003c\/strong\u003e Lower inertia with high thermal capacity and improved engine response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Gear:\u003c\/strong\u003e Integrated ring-gear design on EXEDY lightweight flywheels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTesting:\u003c\/strong\u003e EXEDY states its lightweight flywheels are engineering-tested to 15,000–18,000 RPM and SFI approved\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Application:\u003c\/strong\u003e 2004–2021 Subaru WRX STI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEXEDY SKU:\u003c\/strong\u003e FJF505\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e Confirm the vehicle's engine\/transmission combination and the clutch or flywheel currently installed before ordering. This is especially important on cars with prior single-mass conversions, transmission swaps, or existing EXEDY Hyper hardware.\u003c\/p\u003e","brand":"EXEDY","offers":[{"title":"Default Title","offer_id":50131402817786,"sku":"EXEFJF505","price":69.15,"currency_code":"USD","in_stock":true}],"url":"https:\/\/lgcracing.com\/products\/exedy-flywheel-2004-2021-subaru-wrx-sti","provider":"Legacy Racing","version":"1.0","type":"link"}