I went to this website
http://www.vmptuning.com/store/index.php?p=product&id=184&parent=92
and they need info that I have no idea what they are
what is computer code?
Modifcations and tune requests ????
Rearend Gears?? and what is the octane stuff in the custom tune selection?
Open up your hood and look in front of the battery. To the right of the fuse box, you'll see the ECM. There should be a sticker on it with a 4 character code. That's your computer code.
You'll need to advise them of any modifications that you've made to your vehicle, including tire size changes if you've purchased different wheels and tires that are not stock. If you haven't done anything, just list the CAI that you'll be purchasing. You'll want to list the make and model.
For gears, you'll need to know which ones you have. Since you have an '08, you have 3.31 unless you paid for the 3.55's, which you'll see on your window sticker. You can also confirm your gears by looking at the "pumpkin" on the rear end. There will be a sticker with the gear ratio on it.
The octane is complete personal choice. I run 93 octane performance tunes in both of mine, but it's totally up to you. For the best performance, I would not go lower than 89 octane.
The next time you fill up, let the tank get very low, and fill up half the tank with the fuel you are going to be using with the tune. By the time that tank gets empty, your new tuner and CAI should be there. Fill all the way up with the proper fuel, then install.