This Exedy lightweight flywheel is great for various scenarios. Whether you're into lightly tuned racing, drag racing, autocross, rally events, or just driving on the street, it's a perfect fit. The target audience includes both racing enthusiasts looking to boost their car's performance and regular drivers who want a better - performing vehicle. It's made from solid one - piece billet chromoly steel or chromoly steel forgings. The flywheel is designed to reduce weight and inertia, which helps with engine response. The ring gear teeth are integrated onto the flywheel, adding to its durability. And it has passed engineering tests up to 15,000 - 18,000 rpm and is SFI approved.