Im switching exhausts chaps. My old T5 has a Jetex stainless exhaust. The cat on that car has been through 2 engine failures, last MOT the cat sailed through, however, the cat on my new car is perfecto, so, Im very VERY tempted to rip the guts out of the old cat & use it as a de-cat pipe on the new 1, I know the MOT peeps wont pass it next time but thought it mite be a laugh til next July, any1 done this? Any top tips? Problems etc??.......