Every car is different I guess.....?My GS marginally fails its MOT with secondary cat delete and two bolt US spec manifolds. Eventually got fed up paying my Indy £200 to reinstall the secondary cats for the MOT then remove them again immediately afterwards......!
Thanks. Mine has the US headers with attached primary CATS so should be the correct set up.
I'll have a think as would need to sell my secondary decat sections and straight through rear section to recoup some of that outlay as it wouldn't make sense otherwise.
As I have facelift rear bumper same as GS and GS style US headers I guess my setup would work on any GS as well. Interesting for GS owners I guess.