This Cat-back system is a simple but effective install for your 1998 - 2004 Porsche 911/996 Carrera. It uses all the factory hardware and bolts directly in place of the factory muffler. Built of 2.25 inch 304 stainless steel tubing, it will provide years of maintenance free service. The high flow mufflers and resonators deliver a deep tone with reduced resonance at cruising speed. The system is finished off with four slash cut tips for an aggressive look.