The word "Best" is very subjective.
Best sounding? Best Performing?
Intakes for the VQ DE engine have proven to lose power, so if your going to get it for anything it would only be for sound. In which case it is really up to what kind of sound you like. For that, I would refer to youtube.
If you want the "best" performance, stick with the stock airbox and just drop in a K&N air filter. If you wanna go further, I believe the 06+ airbox is a slight improvement.
Or to make real power, put your money towards something more useful like the plenum spacer above or just go FI
