When i bought mine from jct25 i got the sports cat and downpipe as well as the cat back, think the magnex downpipe and sport cat only fit with the magnex cat back system but the cat back system on its own comes with a flange that connects it to the standard cat. If you get the chance get the downpipe and sports cat too cause in my opinion apart from my cc remap the downpipe and sports cat fitted in conjunction with the cat back system was a massive difference and the best mod i have and transformed my car. Spooled loads quicker and seemed to bring the power band down as a result and after couple weeks of coking up the sound settled down and is teriffic now, not too loud at all, barely above standard at normal revs but with a lovely rasp when you bury the throttle. Which is precisely what i was after.
