Just the color

The only difference between models is that 99's came with a different climate control & 16" rims. The Ironman package is just an emblem thang.

As far as upgrades for economy ... GFL. Let us know if you come up with anything.

As far as performance, you'll have to be more specific. Are you looking for on road performance or off road performance.

The search function should be able to provide you with some very good reading. It's located on the left panel of the home page.