I decided to install the Banks Turbo (Sidewinder) with an intercooler. Did it about 4 months ago and wanted to share some of the outcomes so far. I would be happy to answer questions on either the install or other observations, but let me start with these.
First, prior to the install, I was able to do a full freeway tank drive at 65 miles per hour. It was 13.8 mpg. After the install, I drove the same distance at the same speed. It was 15.2, or 1.4 mpg better. I also did a commute tank test before and after, which included a 3000 ft. pass climb. Before the install my mpg was 13.2 and after was 15.1. That was a nearly a 2 mpg increase. I should add that my jeep has 2" lift on 31" tires and a modified exterior that causes additional drag.
Second, the torque is amazing. Yes, you could see the increase quoted on the stores webpage, but I want to share my experience. From a stop, it accelerates as fast as any new car now. In fact, not that we broke any laws, an LJ challenged me at a light just to see what would happen. Let me say it wasn't even close. And, no, I didn't take his pink slip.
Third, and this is my favorite, the horse power is instantaneous and monstrous! Before the install, I could only climb the pass at 60 mph. before it would drop a gear and push the RPMs to 4000+. After the install, I could do 80 mph IN OVERDRIVE! Not that I drove over the speed limit
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Hope you enjoyed reading this. And as I said, hit me up if you have any other questions.