Review on K&N Cold Air Intake Kit for 2004-2008 HONDA S2000: High Performance, Increased Horsepower (63-3514 Compatible) by Joseph Reed

Noticeable improvement in fit and strong suction growl. Easy installation (take your time). Probably the best bang for the buck for a complete intake system for the s2000. It really cleans the engine bay area, and with the cold air duct instead of the lower intake design, I don't have to worry about puddles. I recommend pulling your computer's fuse or battery cable so the car can relearn how much air is available. Even with the stock exhaust, the car makes loud noises. My setup was on model 06.