Help
Was looking at options on replacing the restrictive cat on my R56 JCW. I wanted to keep the JCW back box and don't think there's much restriction there anyway.
Was going to go with GTT's Stealth cat, but Roland doesn't have any 'to exchange' with my OEM cat and i can't be without my car for 3 days while i take mine off, send to GTT..................and so on
Next up, Milltek. Good quality, not expensive and good gains. So i phoned Star Performance ( nearest place to me i'd trust ) and straight away they said 'NO DON'T DO IT' They have stopped fitting high flow cats to all BMW's, Audi's etc. because they had too many issues with CEL.
Anybody fitted either of these and had any issues?
If you wish to stay anonymous, please PM me
Thanks,
C.