It helps a little, but only at higher speeds. Not worth the extra $$$. I've been wanting to put the oem back on. But been to lazy. I want to see the difference. Once I do that I'll let everyone know. I think the reaction time will be different compared to the AFE. Reaction to the WOT. I think there will be some sort of split second delay upon WOT. But then I could be wrong. I'll see when I put the OEM back on.