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Message: [QUOTE="muthafintank, post: 1112492, member: 15257"] Been running these for about two weeks now on gearhead tunes. Running the factory hpop at the moment which gearhead was supposed to tune for as I wasn't ready to upgrade it along with studs. My previous setup were swamps 176/146 with David's tuning as well. With the swamps setup I was getting 18mpg on the highway. With my current setup I'm getting 9mpg. The FF injectors are noticeably louder then the swamps were. Truck runs great in the tow/economy tune, feels and sounds like crap in the street and all out tunes, no peddle response and less power. Truck felt more responsive with the swamps injectors and more powerful. Are these injectors normally loud? Can my issues be due to the hpop? Is the mpg typical? No idea where to start with the tuning as gearhead is out to sema. Thanks for any insight guys. [/QUOTE]

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