Invidia's regular N1 catback exhaust for the WRX & STI feature 3" stainless steel piping, a resonated midpipe for improved noise reduction, and a flex section for optimal fitment. The the N1 muffler has a JDM look, with a large 4" titanium tip. This system is louder than the G200, but not as loud as the Racing catback, and the included silencer makes it easy to reduce sound for daily driving.