Was going to buy a de-cat today, as have to have centre box replaced, but its gonna cost more than I wanted to pay. I have £200 to spend on my car and dont know what to spend it on. I need to spend £80 on the centre box, and so have £120 left to spend. I could have a full system put in for £180 though... What kind of effect will I see from a full system? Basically, what should I spend my money on?? Any advice greatly appreciated. Oh and so far I have a twin box back box, but no other mods.