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I just plain took my muffler off and all the soot collects where the muffler was. I've got a 2ft piece of exhaust with the mounting part. I drilled holes in the end and stuffed some steel wool in there and made it so the steel wool did not shoot out the back.
The results from that (which definitely had more backpressure than the stock muffler) were less than noticeable. In fact, i actually got my worst mpg.
With the muffler off I am getting the best mileage in my history of driving. Possibly due to the 30-35 lbs of weight dropped, but also I can fine tune the throttle while driving much better.
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