Circuit Werks 1997-2004 Porsche Boxster 986 Polished Mandrel Bent C-Pipes. Fits all 1997-2004 Base Models and Boxster S Models. This is a must upgrade when you upgrade your exhaust. Why left the C-pipe Extensions OEM black/ rusted steel look when you can upgrade to our high polished stainless steel extensions. Just like your OEM pipes, the inlets are 1.75"/ 45mm connecting to your existing OEM exhaust and Stock Catalytic Converters or Test Pipes, clamps directly to your OEM exhaust inlet using your existing OEM hardware or the clamps we provided. Please check out the exhausts, test pipes, and the high flow cats for your 986 Boxster.