Comptechs quiet tip inserts are designed to tone down your 3 1/2 inch Comptech exhaust, reducing decibel levels by 2-4db. Includes drill bit & self tapping screw. Dual Exhaust/V6 cars will need 2 inserts. Does not fit Fits 4 inch tips on NSX, 04 TL, or 04 S2000. Installation time 30min /-