Well, as above, I hear so many things about a car taking its MOT when decat. Whats the deal with it? Will I have to keep swapping and changing it? or ive heard I only need to take the idle emissions test? I have a 97 Glanza on a P Reg. Also what is the best one for me? I have standard mani (for now) and a Nur Spec cat back exhaust system. Cheers