Put in a Eurosport Cold Air Intake today. Took me about 30 minutes. having locking pliers to take the turbo flex hose clamp off is a must! I dunno how long I woulda fought with that thing otherwise.
Definitely changes the sound A LOT, which is kinda cool. I like it in ways, but hate it in others... that whiny hiss of it sucking air while cruising is a little annoying.