The burnout heats up your tires for the event and improves your 'grip' for the event - not by that much, though.
I find it easy to reach 75% 'Incredible Burnout!' (in fact, I've never had less than 75%) but it's quite difficult to reach 100% 'Max Grip' (I probably get this for 1 of the 3 drags).
Phenom
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