2005 added power

Not sure what headers are available for the '05 yet...but I'd recommend getting a K&N air filter at least, or the cold air induction if you want to spend a little more. Headers & a good cat back system from DynoMax or another reputable exhaust company. I don't know which gears come in the rearend of the '05s...but slapping in a set of 3.73 gears would help out a lot. If you still want more...I'd consider a NOS 100 shot, dry nitrous system.