Nissan SR20DET Jun Auto One Piece Lightweight Chromoly Flywheel. Fits S13/S14/U12/U13 Silvia. Also fits PS13 SR20DE. Only 5.3kg ~11.66lbs. 2001M-N011. Highest quality flywheel on the market! Made in Japan. Less rotational mass allows your engine to rev up quicker and get through your power band quicker! Won’t come apart like steel/aluminum flywheels. 200% stronger than stock flywheels! Great for street and track use. Performance clutches also available, please call. Special Order from Japan.