Finally, an all-stainless catalyst-back exhaust system that rivals the best that Europe has to offer! Neuspeed's latest generation of exhausts use aerospace quality T304 stainless metric-sized tubing for maximum flow. Low restriction mufflers and resonators are carefully designed to reduce weight and meet State noise restriction standards. Mandrel bends, TIG welds, and precise fit flanges and mounting hangers are standard on every Neuspeed system. 60mm (2.5") downpipe bolts to stock cat location, transitions to 70mm (2.75") for the remainder of the exhaust system. Dual mufflers are not loud by any means, idle is a nice, throaty burble, absolutely quiet and drone-free at freeway speeds. Once you mash the throttle, the exhuast opens up and lets out a nice shriek, a wonderful, "bidness" sounding WOT system. Fit is perfect like OE and all hardware is included. We searched out many systems on the market and this is our favorite, especially for the price. On average, we've seen 10-20whp gains by just bolting up this exhaust, after chiptuning, this is the MUST do upgrade.