ISR Performance Exhaust Y-Pipe - Nissan 370z / G37IS Z34 Y ISR Performance Exhaust Y Pipe Nissan 370z G37 Q60 3. 7L The ISR Performance 370z G37 Y pipe utilizes 2. 75" stainless steel piping along with bellowed flex sections running from the 2 bolt catalytic converter flanges back to the high performance velocity merge. The Y pipe then steps to 3" stainless piping coming out of the velocity merge to the rear 3" exhaust flange. The Y pipe also features an integrated dimpled gusset plate tying the two
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