Exedy Racing Flywheels are made from solid one-piece billet chromoly steel forgings.  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, and have the possibilities of separating from the flywheel.
 
The steel insert on alloy flywheels also has the possibility of warping which could alter the set clamp load of the clutch cover and effect disengagement.  This could cause the flywheel to explode due to two different expansion coefficients (aluminum flywheel pressed on steel ring gear).  Exedy steel billet and forged steel flywheels have passed engineering tests to 15,000 rpm.  They are guaranteed to be explosion proof at that rpm.
 
Engine Code:  EJ20T
Weight:  14.3 Lb.
 
Actual Flywheel may be other than pictured. 

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