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Message: <blockquote data-quote="Lee36328" data-source="post: 256886" data-attributes="member: 113">According to the website, it alters the signal for those who have electronic throttle control (throttle-by-wire?), so, in effect, it electronically boosts the signal the throttle is sending based on your ankle pressure, i.e. boosting your ankle pressure.  So, pressing harder will achieve the same effect.  It's free, and your ankle gets a workout.Also, I noticed in the e46 for example, the ETC has a perceptible delay before the engine responds.  If the sprint-booster reduces this delay, it will be appreciated by those who like the instant response.The website lists BMW cars after year 2000 as compatible, i.e. having the ETC.(Sorry, stumbled into the e46 section by mistake... For older cars, eg, e36, there is another type of spint-booster which is installed in the engine bay, not behind the throttle pedal, seems to work by advancing the timing, tried it in another car, indeed made a significant difference.  Took my ankle a while to get used to it because it was harder to control or meter the throttle input as stated above.)</blockquote>