is there much difference?

[kentiiboii]

yes. £85.01p.

haha.
Some of the universal ones you can have them made without baffles for same price. I had one done for my 1.4 and IMO they sounded epic it was kind of loud but not over the top loud and it also rumbled wasnt tinnie. Had a tiny pop to it as well. As for the sportex one I couldn't tell you. For my derv I'm going for a universal one till I can afford a nice full stainless.