AZScout wrote:
Nice job, and very interesting. Are you doing this with a CRD airbox or a gasser airbox?
I traded off my CRD a few months ago for the 2007 gasser. I’m using the factory 3.7L air box but added an additional inlet for more cool air. I wasn’t overly impressed with the factory air inlet. The more I thought about it, the more it bugged me. So I spent the last few weeks walking through hardware stores, talking to others on this forum, and trying to come up with the best way to bring more cool air to the motor. I wanted to see if the engine was really starving for more cool air, so I used the “Ram Air Effect” as seen in my pictures. My wife and I couldn’t believe it, she said, “you mean putting that little tube on made that big of a difference?” To be honest, I was shocked!
I thought I might see a .5 mpg gain and was hoping for 1 mpg gain. But a solid 2 mpg increase! All for under $5.00 bones! I hope someone copies what I did or reports similar gains by coming up with their own modification. I have a feeling that NOBODY is going to believe me. 
And I don’t know any L.O.S.T. members locally who can verify my findings.
I laughed because I considered using the downspout before I saw that he had used it. I like the downspout idea because the square end was flexible enough to squeeze through the tight opening to the grill. His inlet is much larger than mine, so I know he is scooping up more cool air. I like the cleanliness and direct route of my installation, but I do plan on adding a second inlet and modifying some sort of scoop to the inlets in hopes to funnel more air into the intake tube. Your right KY Liberty, more air does make a BIG difference, more so than what I had ever expected. Now that more of us are reporting similar results, hopefully more people will start believing us. The is probably the best modification for the cheapest cost.
The factory air filter naturally was clean at the time of the Amsoil filter change. In a very short time I have driven the same 164 mile driving route before and after the install for comparison due to pre and post eye surgery appointments. I don’t know any stock Liberty’s that are reporting 24 mpg. Based on this observation and the fact that I was only averaging 19.8 - 21.7 before the install, I have to conclude that the Amsoil air filter and ram air intake tube increased the amount of cold air being delivered to the motor. My intentions for the install had little to do with fuel economy. Trust me, I didn’t buy a Jeep for fuel economy. My intentions were curiosity and to increase performance. I was really curious if I could squeeze more power from the 3.7. I figured there might be some increase in fuel economy, but I didn’t realize it would be this dramatic. 