if i fit a sports cat and a cat back will i have to get the car remapped straight away and also will the car pass mot time it does say will pass emmisions test does anyone on here have any experience with this before looking at the afterburner raptor cat back btw any reviews on this exhaust aswell cheers.

Yes you will need a remap. Once it's mapped it will pass the mot.

Depends how hot you get your cat before mot,

My sports cat failed 1st time I have it mot'd by about 2% over the threshold, next time I just took it for a 15 mile blast up and down the motorway before hand

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what make of sports cat do recommend and were to get the best price

I got a prodrive downpipe with sports cat recently, fitted it... remapped... passed MOT without issues, was 2nd hand as well.

It's a 200 cel which i'm sure is the same as the one you listed, so with a remap you should be fine

if i just left the standard cat on and fitted cat back will i still get good gains

I gained 26ish HP swapping the centre and rear exhaust sections leaving the standard cat on.