Circuit Werks latest Honda S2000 AP1 & AP2 "BRUSHED FINISH" Test Pipes. Could use with stock exhaust or any other aftermarket exhaust. Tri bolt gasket included along with hardware. This will not pass smog in most states. Fits all 2000-2009 S2k including the CR's. Our test pipes only weighs 3.45 lbs and Brush Finished stainless steel. Just like your OEM Cats, ours uses a stamped OEM style flange on the exhaust side. This will bolt-on to your stock header or any aftermarket headers with a leak free connection.