I had a 07 JKU with the 3.8 with a manual 4" lift and 35" tires. I had 5:13 put in and you would of thought I added a supercharger. Loved it. It was not my DD though.
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I went down to Lowes and bought 4-1" and 4-1/2" Polystyrene foam board. I had a 1 1/2" gap in the door panels i wanted to fill. I was looking for 3/4" but didn't find it so I used the 1" and 1/2". Cost was less than getting their door kits.