Originally Posted by benzy89
Which ever ones delete the primary cats & are cheap. If you spend big money, it makes more sense getting a legit X-Pipe
+ which ever ones use high quality flanges (very important) + seal properly at the joint where the cut is made.
We have seen some low quality versions of this in the UK and also some very cheap X pipes from the far east which do not seal correctly leading to lambda codes being thrown and in some cases where the seal is very poor, misfire codes.