Iv been quoted £280 by rebel power pipes for a 2.5" stainless steel turbo back system with one small box in it. does this sound reasonable or a little bit pricey?
 
Unique exhausts stafford quoted me 250 or 380 with high flow cat, I chose magnex and apr...so wished I would have gone Unique!
 
Nope. The CAT has nothing to do with how much smoke is produced from the exhaust. The bloke was thinking about petrol cars and passing the MOT but knows nothing about diesel cars and how they pass an MOT.