Originally Posted by mark039

The best early mod on my 04 was a diablo predator handheld tuner. I bought mine new but later realized I could of got one used for $200. The ability to tune the trans settings are worth it alone imo. Turn off the tq management and adjust your shift settings and its like driving a new car. The pred will also get you by with the early mods. IMO wait for a pro tune until you get all the mods done. Headers are a must as well.