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Since we were going with a low-buck theme for this installment, and our factory muffler was leaking, we took a Gibson muffler we had laying around for a TJ down to the local muffler shop and had them bend up a 21/4-inch tailpipe to match the Gibson muffler. It's not mandrel bent, and not pretty, but again we saw power numbers and we almost always see 18mpg on the highway now at 72mph.