STILLEN 504252 Y-Pipe Exhaust Pipe - 350Z / 03-07 G35 Coupe Mandrel Bent Stainless Steel Y-Pipe Constructed of 2.5" Piping Up to 3" at the Collector 7 Horsepower Increase For STILLEN Single Path, Stock or Nismo Style Exhausts; Does Not Fit Nismo Models