Poof!
Dan makes a great point about the particular event.
Proper training accounts for 90% of the available adaptation. Depleted training is the last 10%.
For enduro racing, proper training is all you need. The last 10% doesn't matter much for your activity.
For events 3+ hours of hard and steady pedaling, this last 10% may be useful.
Example:
For an XC racer, running foam grips and light saddles and other weight weenie parts to save a pound might make a difference. An enduro racer isn't going to notice a pound and if anything the loss of stiffness / durability are probably detrimental.
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