TEGIWA Decat Pipe. Features high quality tig welded 55mm ID stainless steel 304 pipe work and flanges. A boss is pre-welded into the pipe for the secondary O2 sensor and are suitable to match up to all cat back exhaust systems and the OEM Honda CRZ header - perfect for Fujitsubo, Mugen, and HKS among others. Installing this decat will make your exhaust system flow better and should release a bit of power and added noise. Supplied complete with new bolts and rear gasket.