Taken from my reply in main message area

I've got one of the tuned SCC tuned FRS and mine is currently running 386bhp on a SCC spec gt28 turbo setup and custom Mike Gurney autronic sm4 ecu setup / map

However this power is right on the limit for the standard engines pistons rods, etc - to push past 400 safely you will need very good quality uprated pistons, rods as well as headwork, improved inlet manifold, etc - i would suggest Ian Howell for any headwork or custom inlet manifold - the bottom end however shouldnt require any work though - ideally cams should be uprated as part of the original batch of mods