I think I might try this when it warms up. I've read some reports from users online that said it helped their stock 4.0L Jeep setup. Looks like the one on the 4.0L Jeep will be really easy to build too, Just a square with a big hole in the middle.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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