yes it is verry possiable here you go man
Tutorial to put Vehicles in all Multiplayer Levels
by: Valdek
Step 0: First of all, you'll need to use the same methods of transfering files to and from your Xbox as the offset modifying method. You'll just be editing a different set of data. Here's a link to BOLL's halo hacking tutorial (for the offset modifying method):Quick Guide to Cache EditingAnd Nick's Halo Hacking FAQ for general hacking knowledge:Halo Hacking FAQAnd also, the full output files from Nick's FAQ:Halo Level Output Files
Step 1: First, you will need to look in the appropriate output file for the level you want. In it, find a piece of scenery that you wish to change into a vehicle. (You can do this by searching for 'scen'.) After finding an appropriate piece, look at the identifier for that object. For example, on Hang 'em High, we'll use the flag bases. The flag base's identifier is:0xE18A0016
Step 2: Now, we take the values after the 0x and reverse them in pairs, seperating every second character. This will give you this new value:16 00 8A E1This is the new identifier for the scenery, in editor-friendly format.
Step 3: Now, search the map file for the above value. When you locate it, it should be the rightmost set of values. This should be the complete line:025BE810: 6E 65 63 73 | D0 35 3B 80 | 00 00 00 00 | 16 00 8A E1Now, we'll term the first set of values after the colon as the "class", and the rightmost values the "identifier".
Step 4: Okay, we'll be changing the value of the identifier to the identifier of the vehicle you want.So, we look up ghosts in the output file and find that it's identifier is:0xE6FA0586Now, reversing this value in pairs, we get:86 05 FA E6
Step 5: Now, we change the identifier in the line to the new identifier of the ghost. This will give us this complete line:025BE810: 6E 65 63 73 | D0 35 3B 80 | 00 00 00 00 | 86 05 FA E6
Step 6: Finally, we need to change 'scen' (for scenery) to 'vehi' (for vehicles). Unfortunately, they're written backwards and written in hex. So, I'll just give you the new value straight out...6E 65 63 73 becomes 69 68 65 76
Step 7: Now, save the map and transfer it to your Xbox and load it up. Great, now using this method, you can have vehicles on all multiplayer levels.
Thanks go to PfhorSlayer and Nick for the output values and explanations.