350ztttt

iTrader: (5)

thanks, what should I be doing then? any recommendations? sorry for the thread jack op

mdztuners

iTrader: (1)

I don't think there is a Y-Pipe on the market with a 2.75" outlet...most seem to be 2.5" collectors, 3" outlet. I actually had a conversation with my mechanic about this around building a custom Y-Pipe (2.5" to 2.75") with a muffler built in, since on my last Dyno, I lost 19 whp due to the silencer.

350ztttt

iTrader: (5)

^^do you mean those removable silencers that come with exhausts? And if I have a 3" going to a 2.75", should I get a different catback?

mdztuners

iTrader: (1)

Yes. For example, the exhaust I have (GReddy Racing Ti-C, single exit) comes with a removable silencer that bolts into the muffler. If you want to stick with the Stillen Y-Pipe, you could look for a Y-Pipe back exhaust where the inlet is 76 mm (3 inches) or greater, or get a whole new cat-back exhaust which would solve the problem of trying to match inlet/outlet sizes