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I would install a good turbo back exhaust system anyways for faster the spooling and better fuel economy
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WHEN IN DOUBT FLOOR IT! 
IF IT'S TOO LOUD YOUR TOO OLD!
99.5' F-250 EXTCAB 4X4 6SPD 4" LIFT 35" TIRES 3.73 GEARS
K&N INTAKE, GTP38R W/TURBO MASTER WASTEGATE CONTROLLER,
203DEG THERMOSTAT, EVO II,AND MBRP COOL DUALS EXHAUST NO MUFFLER
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