Slim I've had both a Supersprint and Milltek system. If i had to choose between them i'd go for Supersprint everytime. I'd say the note from the Milltek is deeper, but fitment wise the SUpersprint wins hands down. With regards to decat pipes, i have a Supersprint decat and i can't fault it. They are straight forward to swop, 3 bolts and the Oxygen sensor. MOT wise, it's not a MOT failure if your car doesn't have a CAT, but on the emissions. If you're running a decat pipe and your emissions pass the MOT test, then your car can't be failed....if that makes sense. The CAT itself is very restric