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Long tube headers will open it up a lot. Even shortie headers are much better than stock. The stock cats are a bit restrictive, so I recommend the Mopar headers / cats. It opens up the most restrictive part.
The DiabloSport tuner is a very good choice to. You will see a decrease in milage as it removes the fuel lag and when you use the new found power it will drink more fuel. Both are great. To finnish out the package add cat back exhaust for some more power and the lowest improvement will be a CAI.
A 180 degree thermistat with the fan settings set lower will help keep it cooler, to reduce the chance of spark knock, etc.
Headers, and tuner give the biggest gain, then exhaust followed by CAI.
Not sure if a camshaft is available yet for the vvt engines, but the previous 5.7 it gained about 40 hp which is greater than headers or tuner.
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