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keep very close mileage of every tank. I got 322 to 328 each tabk until i put in k&n air filter. Then i got 355 to 359, driving exactly the same and no reset or battery cable stuff. Then i put on flowmaster full cat back and it went to 340 to 355 range. The filter should def increse your mileage. But like you i lost with the exhaust and am still confused. Get a k&n air filter and drop the trd cai
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"07" 4X4 LIMITED D'CAB 5.7
LEATHER AND NAV(SUX)
CHROME TUBES(WIFE NEEDS EM)
AMI CROME LOCKING FUEL DOOR
F-MASTER AMERICAN THUNDER (DUAL N&OUT)
K&N AIR FILTER(NOT CAI,YET)
SIRIUS RADIO
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