HONDA CIVIC EF CX DX VX SI HATCHBACK 2.5" CATBACK EXHAUST MUFFLER SYSTEM Fitment: 88-91 Honda Civic 3 Door Catback Exhaust System SUS-304 Stainless Made Steel with Polish Finish Designed for high performance as well as meeting sound level standards. With its deep throaty tone, it echoes its racing lineage. Optimize torque in the low to mid speed range 2.5" N1 Design to Gain More Horse Power, Faster Response, Averaging 10-15 Extra HP PROFESSIONAL INSTALLATION IS HIGHLY RECOMMENDED. NO INSTALLATION GUIDE IS AVAILABLE.