Circuit Werks latest 2000-2004 Porsche Boxster Secondary Cat By-Pass (AKA Test Pipes, DeCats, Catless Pipes, Cat-Delete...). Fits all 2000-2004 986 Base Models and Boxster S Models. Fits both 2.7L & 3.2L. Tri-Bolt flange bolts directly to your OEM or any aftermarket headers with our supplied hardware and gaskets. The Outlet clamps directly to your OEM "C" Pipes. Both Test Pipes combined only weighs 8 lbs. You save about 25 lbs off your stock catalytic converters, plus it'll gain/free up about 4-8 hp depending on your intake, headers, and exhaust setup. All combined even more hp gain. Please note that this replaces your factory catalytic converter and might not pass emissions in some States. Also available in Resonated version & the 200 Cell Sports Cats.