I currently own an RB5 WR and am considering a downpipe modification. As the car has PPP I am under the impression the centre CAT was removed during this upgrade only leaving the downpipe CAT. As Mr "Average" I'm not sure if I want the hassle of emission failure every year and having to have a double centre CAT inserted (which I don't own) for the MOT. I have seen a couple of companies advertising sports CATS, my questions are:

1. Will a sport CAT pass the MOT.
2. What will the noise level increase be.
3. What performance improvement will there be in comparison to
a)Standard
b)No CAT
4. Do Scoobysport do a sportcat.

Thanks


David