Just asking to be tried...
• Easy Tank Money
Get 2 tanks, anyway you want to, and then simple ram one tank with another, your funds will go through the roof.
• How to Fly the Tank
This might sound absurd, but it works. First enter the code to get a Tank, then enter the "Fly With Cars" cheat (codes page). Get into your Tank, turn the turret 180 degrees so it's pointing backwards and start firing the cannon rapidly. Continue doing this until you gain altitude. To turn, just turn the turret slightly. Avoid the tall buildings and you'll do just fine!
• Lightless Taxi [by CoyoteMystro & Alienfish]
The lightless taxi can only be caught after saving/loading, it is a glitch where the game doesn't load all items. And you save the game with the taxi lightless so it stays like that. This theory makes it POSSIBLE to get a lightless cop car!
• BulletProof Barracks OL [by CoyoteMystro]
This vehicle can be obtained when playing the "Arms Shortage" mission from Ray. During the mission, the vehicle will be BP. It will be normal before and after the mission.
• BulletProof/ExplosionProof/FlameProof Bobcat [by CoyoteMystro]
This vehicle can be obtained in the "Evidence Dash" mission from Ray. During the mission, the Bobcat that has the mission packages is BP/EP/FP.
Flip the Bobcat over then push it to your hideout. Don't worry about the rest of the packages, as the game will generate another bobcat in town.
• BulletProof/ExplosionProof/FlameProof Cheetah [by CoyoteMystro]
This vehicle can be obtained in the "Turismo" mission from El Burro. During the race, flip over one of the cheetahs than push it to your garage. Do not let it out of your sight, and wait until the turismo mission has finished.
• BulletProof Patriot [by CoyoteMystro]
This vehicle can be obtained after completing the "Marked Man" mission from Ray.
• BulletProof Securicar, ExplosionProof Securicar [by CoyoteMystro]
You can obtain a BP securicar in the "Van Heist" mission from Joey Leone. After damaging the vehicle, drive it to your hideout, and blow it up in your garage.
You can obtain an EP securicar in the "Escort Service" mission from Donald Love. Shoot the vehicle to blow it up, then push it to your garage.
• BulletProof/DamageProof/ExplosionProof/FlameProof Stetch
This vehicle can be obtained in the "Salvatores called a meeting" mission from Toni. Once you visit Toni, head to Joeys but DON'T go into the blue field. Instead, park a vehicle near the wall on the side of the building, then enter the speed-up cheat code, then run between the vehicle and the wall, this will cause you to walk-through the wall. Then enter the Stretch and backup into the blue field, the vehicle will regenerate. Afterwards, drive it to your Staunton hideout by flying over the Callahan bridge (using the dodo physics code). Head to 8-Ball's bombshop, rig the car with a timer bomb, then activate the car-bomb in your garage and leave, don't let the door shut! After the vehicle explodes, walk out letting the door shut, so the vehicle regenerates.
• Secret Speeder
Go to the airport, and go/drive down the runway that the planes don't use until you get to the cliff, drop down the cliff, and there you have it - a speeder (Warning, you will lose 3 points falling down).
• Easy Way To Evade The Police
Here's a simple way to get the law off your tail. Do a lot of vigilante missions until you get like 1 or 2 police bribes in your safe house, now if you're fast enough, you'll get there before they get you.
• Respawning Weapons & Items [by GTAfreak3]
If you need more weapons or something extra that can respawn (like the weapons, health powerups, etc.), pick them up and go into your garage on foot and run up to the back wall. Once you do this all the items you should have picked will respawn and you can pick them up again. Do this as many times as needed.