i can remember once getting stopped in my 1.9 gti by the boys in blue they checked the tyres and the emmissions and just about everything else they could get there hands on cant remember quite wot exhaust i had on at the time but they were saying that it was 2 loud and if they could test it it would fail on noise but luckily 4 me they didnt have anything 2 check it with dont no how relevant this is just thought i would say