Fujitsubo's RM01-A catback is one of the highest quality systems on the market. It features full stainless steel piping with beautiful welds and is 50% lighter than most OEM exhaust systems. The piping diameter is 76.3mm and exits through a 99mm exhaust tip. The system produces right around 88dB and is the perfect sound level for any street driven Evo. The system includes all hardware to bolt right on to your Evolution 8 or 9.