well iv been running the truck lvl 3 with 91 like my custom tune was made for and has been running great but i live in orange county california so its not hot so i dont run ac but when i went on my trip i had to run the ac and i put it on max and i was getting the loud vibration in the pedel its at its worse when i hit 70 mph
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2008 F150 FX4 BLACKED OUT 2.5" LEVELING KIT STAGE 2 AFE INTAKE FLOWMASTER SERIES 40 TURN DWN 3" PIPE 285/65/R18 GRANETE ALLOY ULTRA BLACK MAGNUS RIMS WITH NITTO TERRA GRAPPLERS..COMING SOON GRYPHON CUSTOM 91 TUNES
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