Berk Technology’s Honda Civic SI Track Pipe / Test Pipe is a direct bolt-on replacement to the factory catalytic converter. Features 3″ stainless steel tubing and a very smooth transition down to 70mm at the catback flange for compatibility with stock and aftermarket exhaust systems. Also features a J-Bend extended O2 sensor bung to help prevent the dreaded check engine light. **Off Road Use ONLY!!! May never be used on a public road or highway.