By default, the Agent has three Agency vehicles available at the garage in the basement of The Keep; with the addition of the Free-For-All and Gettin' Busy downloadable content packs, additional vehicles are made available and most non-Agency vehicles can be brought back to the garage which allows them to be spawned.
The Agency Supercar
The Agency Supercar is basically the Agency's version of the Batmobile. What this means, is that it's fast, sleek, sexy, black, and it shoots guns. Here's the overview of the Supercar in each of its four levels.
The first level of the Agency Supercar is very basic. It has no extra features, it's just nice-looking, and it goes fast. Top speed is just over 100Mph.
The second level of the Agency Supercar is also quite basic. It's only extra feature is that it changes its appearance when you jump in. It looks nicer, and it goes faster. Top speed is around 120Mph.
The third level of the Agency Supercar makes it much more advanced. It changes more drastically, and it is much faster, but it also becomes easier to handle at top speed. Level 2 also has better handling than Level 1, but it's not as noticeable than Level 2-3. The top speed is much faster, around 160Mph.
At the peak of your driving skill, the Agency Supercar also reaches its peak. It's appearance changes very drastically, going from humble sports car to over-the-top, supercar on steroids. And you'll love it. It also gains better handling, plus the use of guns. Yes, GUNS pop out of the side of the car and you can use them by pressing B. The guns are automatic, and they are powerful too. The Supercar also seems to become a wedge, so you can now just plow under cars, sending them flying up into the air as you drive around. The top speed now becomes a ridiculously high 200Mph, faster if you can get it going downhill.
The Agency SUV
Off-roading excitement! The Agency SUV is a great off-road vehicle which has amazing traction and handling. Read on for its overview of the four levels.
It's an SUV. No big deal, no cool features. Top speed is around 60Mph.
Still and SUV. However, it handles much better, on or off the ground, meaning you can get some stunts in now. It's appearance also changes a bit. Top speed is around 100Mph.
This SUV is now a sweet ride. Great handling, again on or off the ground. It's appearance changes drastically, and it also starts driving OVER cars instead of just crashing into them. Top speed is around 120Mph.
You now have the most kickass SUV you will ever drive. It's handling cannot be challenged, soaring through the air, doing all kinds of flips and swerves. It can also suck down into the ground, making it super-handling, slightly faster, and it can drive up walls, all by holding down B. Unfortunately, it only lasts 5 seconds or so, so use it wisely. If you let go B early, the car is bounced into the air, meaning that you can start making the car do jumps off of flat ground. The SUV also now drives over all cars, never crashing into them. Top speed is around 150Mph.
The Agency Truck Cab
The Agency Cab is basically a truck cab that goes fast. Read on to see the overview of it.
The Agency Cab doesn't go fast, but it does plow cars out of the way. Top speed is around 40Mph.
The Cab now goes faster, and plows through more cars. Appearance changes as usual. Top speed just over 70Mph.
The Agency Cab goes much faster than usual, however it is still slow. It can plow through almost every car, knocking them aside, causing general mayhem. Top speed is between 90-100Mph.
The Agency Cab is now fast, and furious. Plowing through cars, the Cab doesn't stop for anything. The Cab changes appearance drastically, transforming into a fierce monster. Also, the Cab now gains the ability to accelerate faster by holding down B. Top speed is about 130Mph, however, if B is held for a long while, the speed can reach 150Mph.