ISR Performance ST Series Exhaust - 03-07 Nissan 350ZIS ST Z33 ISR Performance ST Series Exhaust for Nissan 350Z The ISR Performance ST Series Exhaust for Nissan 350Z is a Y Pipe Back exhaust system that utilizes a Stainless steel 2 bolt 3" flange that splits into 2 2. 5" pipes with bottle style resonators and continues back to an aggressive muffler section with 4 tips. This exhaust gives your car not only a great look but a deep tone that every enthusiast is looking for. Our ISR 350Z ST Exhaust is