I run iridium plugs, synthetic oil, have a full cat back exhaust, k&n intake, and the superchip. performance was greatly improved! i have 33" tires and before superchip i ran a 11.2 0-60, now i run 9.7. mpg went up about .3.
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06 4.7 | Modded 6" Lift | JBA 6" Coils | Rustys Rear UCA's | Fox Shocks | JBA UCA's | Gibson Catback w/ FM S44 Muffler | K&N CAI | Hypertech | 4.56 Gears | Powertrax Locker | Autolite Iridiums | Mobil 1 (engine&diff) | 34" BFG AT's | 20x9 Ultra Gauntlet | EBC Dimpled&Slotted Rotors | Hawk Ceramic Pads | Blue Interior LED's | Husky Floor Liners | VVME 8000k HID | Pioneer AVH-P8400BH | Tinted LED Tail Lights