Have you monitored your intake temps now you've drilled your air box? My average used to be 25ish with the engine cover not drilled. Drilled it, and the average temp went to 48, even saw 54 at one point!

I've had to put my induction kit back on because the car was as flat as a fart with those stupid high temps.

Apparently when your intake temps reach 45-50 you're losing about 20% of power due to the heat soak!
 
Cleaned, SRP'd and HD waxed:

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Sam