What diameter is our exhust pipes?!?!
I bet you are intereted so you can order the exhaust bypass, right?
The diameter you "measure" will depend on the exact location of the "bypass cutout" and then will also depend on whether you use a inner-slip, outer-slip or butt fitting. Take your car to the exhaust shop and have the tech that will do the work measure for you. $10 job and no problems later.


