KOS KEV : That sounds about right.....but remember you were running a .63 ......... Modified Head.........Grey's...........L8 ECU.......Live Mapped, and a huge 35psi of boost. Assuming it was a good engine, then that was still very good to achive anything over 400bhp.

So a standard engine running a .48 has no chance of getting 400bhp at all. If it took you 35psi of boost, modified head, L8 Ecu and a Live Map.....then a .48 is going to run up to about 360 absolute max.

I remember when Mike R was recomending a set-up to go beyond Stage 3......I ran a T34 .55, Big Intercooler, Greys, Live Mapped on a fresh engine on standard cr, and could still only manage 368BHP....and that was running at 2bar (30psi), and I don't think the turbo would have lasted too long at that boost.