Have questions about Borla cat back

I had a 00 Camaro 3.8L with the Borla cat back, recently I just got an 02 Z28 and my question is will the borla for the 3.8L work on a 5.7L?

It might, basically same body. i would check the inner diameter to make sure they are the same.

fromwhat i've seend, catbacks for the v6s are typically 2.75"

which is the same size as stock exhaust on a v8....aftermarket systems are always 3" or bigger

I measured the piping and it is 3" My main concern was the muffler being fit for a v8

How big is your muffler? I can compare it to my Borla.

It has 3"inlet and 3" oulet to the tips. I have posted this question on other forums and others have said it will fit except for the piping over the axle???

why would the piping over the axle be different?