Re: Does anyone notice their gas mileage decrease with the new muffler?
i just logged 29.2mpg today on my fillup. i've been doing alot of tire spinning and give it all it has take offs over the past week since my stepson is visiting and i'm showing off. i have now doubt i could have broke 31 not hot rodding. my first take i dropped to 26mpg. i have an aero turbine 2.5" muffler and a home made cold air setup.