Had a cat back magnex on mine when i bought it.
I put an early saph 4x4 non cat downpipe on and had the cats removed by a straight through pipe fabricated by my local powerflow exhaust dealer.
It revved up a bit better after this but i have since changed it for a full mongoose system from turbo back and its so much better. And sounds better than the magnex aswell.

Only problem now is mot time. Got through last one but may have to have a sport cat fitted next time.

Cheers Chris