I did a quk search but had no luck , whats the pipe diameter of the stock g exhaust midpipe ?

I think it's like 2" , but I could be wrong.

ya i cant tell from looking at it, i think its 2.25 , but can be 2 i cant tell

It's actually 2.5".

Right at about 2.45" ID (inner diameter). That's pretty big piping for a 3.5 liter V6 seeing that my 94 Z28 LT1 has the same exact sized piping.

Thanks.