hey guys thinking about purchasing one of these: AUDI A3 96-03 20v 1.8T TURBO EXHAUST DOWN PIPE DECAT | eBay Just wondering, does the car need to be mapped to run this properly? im new to a petrol turbo so i need to ask these things lol does it fit straight on to a standard cat back? i will get an s/s cat back at some point, but if i need an s/s cat back now i will hold off. is it to hard to fit? doesnt really look it but i'll ask anyway. Im just after a bit of noise and hopefully a small gain in performance too. Also, im unsure if these 2 can actually be linked together, but if i fitted this, and put a cone filter on will the decat power increase, help lose the flat spots the cone filter does on standard map?