Fitment Information Infiniti G37 (2009 2010 2011 2012 2013) Will not fit AWD models 2.5" piping steps to 3" This will not work with a Nismo Model Catback Exhaust (OEM or Aftermarket). Emissions Compliance This is a Y-Pipe and does not alter, replace, or modify any emissions equipment.  This item does not ship to California.  What's included? 1x Exhaust Y-Pipe 2x 2.75” 2 bolt exhaust gaskets 1x 3” 2 bolt exhaust gaskets 6x nuts 6x bolts The ISR Performance 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 individual runners together for increased strength and rigidity.The ISR Performance Y pipe was designed to provide the best possible exhaust tone, ground clearance, and performance, all at an affordable price!