marcx5: I read it at another post, but what the dealer told me it feeds more fuel, so it either 1) feeds more fuel or 2) changes the responsiveness of the electronic throttles, so that less input with your foot on the accelerator pedal yields more output from the throttles than when in normal mode. I think it is number 2 since that is pretty much the function of the e46 M3's.

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Sasakyan Kita
'96 E36 / '02 E53 Sold / '07 E70