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No it won't hurt your mileage, it just ups the shift pressures in the tranny. And yes, by that i mean a physically firmer shirt, like chrip tires into 2nd firm on the higher settings.
but for a dd, thats all its gonna be its a firmer feel. you won't see any gain unless you consistantly like to race up to speed on on ramp and at lights. it doesn't mess with the ecu at all so there is no pwer gain.
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2001½ F150 XLT Crew Cab- true dual glasspacks with x-pipe, AEM intake, SCT X3 with VMP custom tunes, full stereo system, HID 55w heads and 35w fogs, 35% tint front and 20% rear, Lightning tail lights
04 F6 Sno Pro Team edition- MBRP race can, ODS clutch kit
01 YZ125- bored out to 144, PnP cylinder and head, Pro Circuit WORKS suspension, many other mods
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