Go with the "Ghetto Freak"
You just drill out the bottom of the air box. That's free and takes 30 minutes with two beer breaks included. It is also easily reversible.
Look in the tech vault for the destructions.
Ihad both a freak kit as well as a drilled air box and there is minimal if any difference in performance. You can always buy one of the pricey kits later if you don't like the results.
