The K&N intake is better than the 3" zzp one. My wife's redline had the K&N and mine the ZZP and hers sounded better and was a bit quicker.
I am getting the itch here for the K&N
My mechanics say it will take some extra gas too
Will I be spending more at the pump?
ZZPerformance I guess isn't as popular in the east
I know the guys on Gas Monkey talk about them though imp: