FX Racing Lightweight Chromoly Flywheels are made from 4140 one-piece forged chromoly steel. They are specifically designed to reduce weight and inertia for better engine response. Most incorporate special design features to enhance the air flow to improve the cooling of the clutch. The ring gear teeth are milled onto the flywheel unlike an aluminum flywheel where the ring gear is pressed onto the flywheel which has the possibility of separating from the flywheel. All FX Racing Chromoly flywheels have passed engineering tests to 12 000 rpm. After professionally installed the flywheel requires a 500 mile break-in period. -Ultra heavy-duty and weighs only 10.6 lbs (Stock flywheel weighs 19 lbs.) -Meets or exceeds SFI 1.1 specification -Made from 4140 forged chromoly steel (2X stronger than billet steel) -FX Racing Lightweight Chromoly flywheels incorporate special design features to enhance the airflow for improved clutch cooling -FX Racing Lightweight Chromoly flywheels work with every clutch including Exedy ACT Fidanza Clutchmasters and other OEM clutch kits -CAD designed CNC machined and computer balanced Vehicle Application Fits 2003 - 2007 Pontiac Vibe GT (1.8L DOHC 4cyl 2ZZ-GE 6 speed) Fits 2000 - 2005 Toyota Celica GT-S (1.8L DOHC 2ZZ-GE 6 speed) Fits 2005 - 2006 Toyota Corolla XR-S (1.8L DOHC 4cyl 2ZZ-GE 6 speed) Fits 2003 - 2008 Toyota Matrix XR-S (1.8L DOHC 4cyl 2ZZ-GE 6 speed)