I have an Injen SRI (short ram intake), and it is pretty good. if you shop around you can easily find it for $150, I 've had mine for about 2 yrs now, and am considering, replacing the filter part with an universal K&N, they make great filters.You can also go with a K&N SRI, but that'll be a little more $$$.Or, buy a K&N stock filter replacement, and you will definitely feel some difference. ($40-50 investment)There has been some talk that a stock airbox is actually better than a SRI. But you will always find diferent opinions on this subject.Good Luck! and be safe!