i run the cold start injector fromboost switch which gives me aprox 5-7% more fuel as said above, then took it to top gear performance and they turn the whole ke-jetronic unit up thus giving me around another 4-5% more, i running jus over 280 bhp, at 21psi, fuel does lean off towards top end tho, but respecting that my cardont rev past 6k it dont worry me