I only have a sports back box on her and will be getting the precat removed as soon as! The car feels different due to having a cat that works, the one I had on was from kwick fit and was to small which made the engine fight its self . It was choking on the fumes. It had lost its boost due to the fumes not been able to flow freely. The car idles a lot better too. Ill be getting a lot more mod's done when I'm back from Sweden and I'll have a lot of cash to spend on them too, so I'm looking forward to getting some nice work on her, i.e.. precat , induction kit , manifold etc. I'll be looking for some info when its time . I have a dual back box on her now but the girlfriend didn't like the sound of it and after a while I didn't like it either so I block up one side of it to bring the noise down. Now I'm thinking I want it back because I've got the power back . It gave a lovely burble and nice pop when changing down gears. Lets say you could hear me coming from a distance !! :oops: