Thanks mate. Ive ended up buying a secondary high flow sport cat ( as its underneath where its been de cated) from a company called magna flow. But now i am starting to think it may be the primary cat on the downpipe that has failed as ive had the car 3 years now and have passed 2 years previously on emissions. I am sort of thinking whats the point in putting a cat on underneath when primary may have failed. Its booked in an exhaust garage next week and will have a better idea. May be a bliw or a leak in exhaust system. But anyways cheers for advice pal first post on this forum and i plan to keep my scooby as long as i can but dam its been a pain since i got it.