Red Earth found out how to get 10 bhp more at NO COST.......when there is a need to accelerate hard (especially when there is a 328i behind him with xenons blazing), he turnings off the a/c before flooring it....this turns off the compressor which makes it easier for the engine to spin...more power.....
To reduce the time lag.....currently : drop gear, turn off ac, floor it........he should look for a modification to ecu that when floored, the ac would turn off automatically for 30 seconds or so.......