For those who have never seen this, or tried it on the xbox, you can drive the rc bandit like any other car.
I've taken these instructions fom a post on the gtaforums by Chirper and editted them for the xbox. (Only things i changed were the flags and the deleting the final file.)
Here's how to make it.
Open the "default.ide" in your GTA3 data folder.
Scroll down to the vehicles section. Find car number "95" (Sentinel) and change the number to "131".
Now, scroll down to another car with number "131" (RCBandit). Change that number to "95".
Save the file and close it.
The Sentinel and the RC Bandit is swapped.
That means that all the Sentinels in the game are now RC Bandits and the RC Bandits are now Sentinels.
We are not done yet! Before you can drive the RC Bandit you will have to make GTA 3 think that the RC Bandit hasn't got any doors. By default GTA 3 thinks that the RC Bandit has doors and when you enter the car the game can't find any "door-animation" wich causes the game to crash.
Open the "handling.cfg" also located in the GTA3 "data" folder.
Find the RCBANDIT line and replace it with this line:
RCBANDIT 1500.0 0.8 1.5 1.0 0.0 0.0 -0.1 70 2.0 1.0 0.47 5 150.0 35.0 4 P 10.5 0.53 1 10.0 1.6 0.1 0.2 0.0 50000 0.25 -0.09 0.5 A118 1 1
Then save and close the file.
Delete GTA3.CAP.Final and load your game.