Upgrading vehicles exhaust system is a great way to build horsepower, free up trapped torque, and improve upon restrictive factory systems. The larger pipes, low-restriction mufflers, and tuned resonators of a well-designed performance exhaust system can make a world of difference on your vehicle. The net result is lower auto exhaust backpressure, more horsepower, more torque, and a much better sound. Compatible With Civic DX LX CX VX HX 1.7L 2001-2005; Fits Federal Emissions Models Only; NOT Legal for sale or Use in California, New York, Or Maine Emissions Models