ALL I WILL SAY IS THAT I DROVE GUS'S CAR WHEN DONE IN THIS SPEC WITH STU AND IT USED TO GO LIKE F*CK now it has a bit more top end but back then it killed a M3 evo no probs gus runs a cometic head gasket as so do i and that aint been a prob yet its the best grey's conversion I've been in and ive been in quite a few