Quote:
Originally Posted by Billy10mm
No real reason it would be bad except for the mess, but why? The opening provided is enough to relieve the underhood pressure. Remember, this isn't about large volumes of air, we aren't talking about feeding the radiator here. This is just a small opening that allows air pressure a place to escape to.
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Maybe it is "enough"

I don't know...but I can see how removing the tray would draw a lot more heat out of the engine bay, and reduce the up force even more.
All of this probably only matters on the track, and the tray is easy to remove for track day, and put back on after.