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    2008 GT, new exhaust, big mileage drop, help!

    Hello, I am new to this forum. I have a 2008 Mustang GT, 4.6L 3V 5Spd manual. Previous engine mods were: K&N Aircharger AiRaid throttle body spacer Jet MAF sensor With this setup I was consistently seeing an average of 19-22 MPG during all normal driving conditions city and hwy. Oh, and 87...
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