i have a 98 chevy suburban, i have a k&n air intake high flow flowmaster cats new o2 sensors, super 40 duel in dual out high flow muffler, i think the rear is 3.73 10 bolt, and a 4l60e and im running 265/75r-16 general grabber at2 i get 18-20 on the highway and 14-16 in the city, i will be doing a custom tune to hopefully get better gas mileage!!!
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