Frank, been called a lot of things in my time, but no one has ever called me gay!!! Yes, I have a sports cat on my car, but as far as passing an emmisions test, I have no idea in practice, only the say-so of others as to whether it will pass an MOT or not. AndyF told me during mapping that a full decat would be worth another 20 or 30 bhp (if I remember correctly). Not really worth the hassle of using an illegal system (I get pulled for number plates, no need to give plod more reasons to pull me!). In the end, my car got 343/400 with the sports cat and VF34, plenty for me (hahaha, we'll see about THAT - says the little devils voice on my shoulder!).
If you are not concerned about numbers, why even bother? If its sound, I can't say that the sound of my car is really any louder with the sports cat.