Just goto download.com and type in "hex editor" in the search bar at top. Get a program called hhd hex editor or similiar name. Works great.
This below was posted in a PM to me from rg8182. Just type in the starting value's and change it to the number listed. Not that hard.
Sidewinder:
PART 1: Swapping physics. In order to get vehicles to fly, they need to have the ghost's physics, so in essence, you don't need to change the ghosts physics, only the warthog and the scorpion tank. But in order to do that, you need the RAW OFFSET of the ghost's physics. This is where those files I mentioned above come in handy, without them, you can't do much.
RAW OFFSET (Ghost): 10 14 8F 80
The value above is what you're going to add in when you find the offset for the warthog and scorpion. That part, I'm still a little sketchy, but here are the values I got. Just go to these offsets and enter in the value above. Remember, don't add anything to these, just go there.
(So goto Tools, and click on Goto in the file menu of hex editor. Type each number in and replace with the 8 digit number above.)
Warthog: 26d0fd8
Scorpion: 26d1e58
PART 2: Adding in the banshee code.
Now that the vehicles have the ghost physics, you need to add in the Banshee code. Here are the offsets.
(Again goto these starting areas and enter any one of the 2 posted below.)
Warthog: 2BBEB2C
Scorpion: 2BF176C
Ghost: 2C0FD64
Hover: (Means vehicle hovers in air if your not moving and doesn't fall. I like it. But don't worry, if you jump out or get shot out, vehicle falls down to ground.)
05 00 00 00 AE 47 61 3E 00 00 00 00 6F 12 03 3C
6F 12 83 3C F9 0F C9 3F 00 00 00 00 00 00 00 00
CD CC 4C 3E
No Hover: (Vehicle flys more like the banchee one and decends if your not moving.)
05 00 00 00 AE 47 61 3E 8F C2 F5 3C 6F 12 03 3C
6F 12 83 3C F9 0F C9 3F 00 00 00 00 00 00 00 00
CD CC 4C 3E
Then just save after changes are made.