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Old 01-22-2013, 05:20 AM
///M-ratedE90's Avatar
///M-ratedE90 ///M-ratedE90 is offline
Ego writing cheques that
Location: the body cannot cash
Join Date: May 2008
Posts: 6,204
Mein Auto: Subaru Forester
The sprint booster is good for heel-toe gearshifts under braking on the street. It makes the throttle too twitchy on the track. The car feels more powerful because of the immediacy of the throttle response. I believe most tunes on NA engines do this to make your engine feel more potent, as the power gains, especially on a BMW, are relatively minor. Turbo's engines are a different story in terms of power gains.

You don't need both.
Also available in Alpine White...
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