Circuit Werks latest Honda S2000 AP1 & AP2 "BRUSH FINISH" Test Pipes with Anti-fouler. Could use with stock exhaust or any other aftermarket exhaust. Tri bolt gasket included along with hardware. A Non-fouler is included to prevent Check Engine Light. This will not pass smog in most states. Fits all 2000-2009 S2k. 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. This will bolt-on to your stock header or any aftermarket headers with a leak free connection.