Raise

iTrader: (31)

I dont have a catback right now, so Im looking to just put a bullet muffler of some type on the end of the stock y pipe. Im not sure what diameter the stock y pipe is, but I know its reduced at the very end for the catback to slide on. Does anyone know what size it is at the very end? What diameter bullet do I need to buy to fit the end?

01FormulaTA

iTrader: (20)

Im wondering about the exact same set up? anyone have pics or sound clips

senicalj4579

iTrader: (41)

i'm not sure but when i did my headers and exhaustit looked like the y-pipe was 2.5 and then moved into 2.75 where it would slide into the catback I pipe.

SSpdDmon

iTrader: (10)

Y-pipe to I-pipe is a 2.75-inch connection. Most aftermarket catbacks conform to this. I also think most header ORYP's conform to this as well since they're supposed to work with the stock exhaust. If not, they would require some minor cutting of the I-pipe and connect where it's diameter is 3 inches.

5_02ls1

iTrader: (20)

its 2.5 ive done alot of exhaust work never seen 2.75 on a gm.i just replaced my entire setup it was 2.5

Gary Z

My 02 Z's stock intermediate pipe inside diameter is 2.75 inch.

SSpdDmon

iTrader: (10)

You must be remembering wrong. Check the application notes.

http://store.summitracing.com/partde...725+4294908395

That's a replacement i-pipe for the stock exhaust system.