before I get bashed - there is no way I can put another bung pre cat in the car.
The car is an 04 GTO with JBA shorties on it. Have a JBA mid pipe with high flow cats ready to go in again (long story - but painful). Anyone who has worked on these cars will tell you there is no room to work in the pre cat area with a shortie or stock exhaust manifold, a sadist must have put all of the braces in the way. Believe me I have the scars to prove it from the first go around.
Now since I am keeping the shorties & cats in, does it even make sense to weld a bung post cat or will the readings be so far off as to be a useless exercise of even mmounting the WB?
If I can go post cat - rough idea as to % I will be off? I have done a few searches and still can't figure out how far out the post WB AFR will be.
I know - not optimum - but just trying to make the best of the hand I am dealt.
Steve