Anyone used one, and if so what gains have you seen with just this and exhaust system?

I'm currently running one with my Piper cat back, but as I'm now approaching MOT time I'm half tempted just to stick the standard Cat back on and leave as is.

So, worth it, or sell it??

Im in the same boat. Iv put the standard cat back on now for mot and cant be bothered to put decat back on. Although it makes a hell of a difference in my eyes. Turbo spools up quicker. I might just weld in a cat on my 3" downpipe.

No not worth it, so remove it and i'll give you a tenner for it

Im in the same boat. Iv put the standard cat back on now for mot and cant be bothered to put decat back on. Although it makes a hell of a difference in my eyes. Turbo spools up quicker. I might just weld in a cat on my 3" downpipe.

Kinda answers my question I suppose!

For the sake of a couple of hours a year I think I'll keep it

when you take it off for MOT take it somewhere and get a 200 cel sports cat welded into it before you put it back on