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So.... I forgot to put in an update on this issue. I had a discussion with the head service guy at the local dealership..... turns out that it is something in the truck's programming that causes it NOT the design of the muffler system per say. The ATAK style just amplifies the result. What happens under full throttle is the computer shuts off the fuel briefly right before is shifts to help prevent damage to the transmission. That's why I see the fuel mileage bar drop all the way down as it shifts because the fuel is cut off. This causes it to pop or backfire. Makes a lot more sense now.
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