It is designed to create negative pressure behind the airdam so that higher pressure air rushes in to fill that low pressure void thus cooling the radiator and engine. I learned that on this forum! P.S. Mine is at the bottom of a mud pit.

 

did u notice a differance?

 

dyolfknip strikes again!...hahahah!...how'd i kno this was coming!

 

I first lost mine when I backed over a stump and it caught and pulled the air damn off. I didnt notice a difference but I put it back on anyway. Then I was backing out of a big puddle and the water pulled it off again. It has sat in my garage since then. I have driven on long drives since then (6 hour+) and never noticed any difference.

 

I just took mine off this weekend...the jeep no longer has a "Leno" chin!

 

yeah mine ripped off the first time someone had to pull me backwards out of a rut...they seem cheap and useless if you ask me

 

small mpg increase for those driving back and forth to the mall.

 

Yes it does. A little, but not on the trail

Its the air flow dynamics. If removed you will notice "hood flutter"

LOL... but a decrease in highway driving.

 

If you remove it, you wont notice any difference. Just take it off, cause it looks a lot better that way.

 

any chance someone could post up a picture of one with out it? preferably on a somewhat stock jeep if possible