ISR Performance Exhaust Y-Pipe - Nissan 350z / G35IS Z33 Y ISR Performance Exhaust Y Pipe for 350z G35 The ISR Performance 350z G35 Y pipe utilizes 2. 5" 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 individual
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