What exactly has been done to your car? I agree with greddygo I find it hard to believe you would lose that much power on a FMIC.I decided on the blitz kit mainly for the reason it was pretty much a direct fit and we didnt have to cut any holes in the chassis or trim the fan blades for the return pipe. I didnt spray blitz on mine either and would prefer it to be bland as Idont want to attract theives.
Cheers