While GTA Online is booming, with new and exclusive vehicles being added regularly, the story mode (or offline mode) of GTA 5 also has an attractive collection of vehicles that you can drive around the roads of Los Santos.

The story mode vehicles can be bought from the in-game online store just like you would in GTA Online. But, you can only buy up to four vehicles per character with an additional two car storage spots being available at their respective safehouses. You can store up to two cars at Michael's safehouse, two cars at Franklin's safehouse, and one car at each of Trevor's safehouses (Trevor has two safe houses).

After completing the heists in story mode, you will most likely hit the various car dealerships and look for vehicles worthy of your hard-earned money. This guide is here to walk you through the vehicle selection process, so you end up with the best vehicles available for purchase.

In this guide, we cover the top 5 fastest cars in GTA story mode. If you're looking for a GTA Online version of the same, then feel free to check out our guide here.

All the speed stats mentioned in this article have been confirmed by Adam "Broughy" Brough, who has tested every single vehicle added in GTA 5. Broughy has a custom race track designed specifically for the testing of these vehicles.

5. Pegassi Osiris

The Pegassi Osiris is a Pagani Zonda inspired supercar that was introduced in GTA 5 and Online as part of the Ill-Gotten Gains Part 1 Update on June 10, 2015. The Osiris is a 2-seater All Wheel Drive (AWD) that weighs around 1,350 KG and can reach a top speed of 122.00 mph (196.34 km/h). The vehicle has excellent acceleration and speed stats, as well as decent handling and braking.

The Pegassi Osiris is available for purchase from Legendary Motorsport for $1,950,000. It can be sold for $1,170,000.

4. Progen T20

At number four is the Progen T20 which was added as part of the Ill-Gotten Gains Part 2 Update on July 8, 2015. This 2-seater weighs around 1,395 KG and can reach a maximum speed of 122.25 mph (196.74 km/h). It has excellent speed, acceleration, and handling stats but not the greatest brake stats. However, the braking can always be improved by customizing the vehicle at LS Customs.

This AWD can be purchased from Legendary Motorsport for a hefty $2,200,000. You can sell the T20 for $1,320,000.

3. Truffade Adder

Coming in at number three is a Bugatti Veyron inspired vehicle that was once known for being the fastest vehicle in GTA 5 story mode. The Truffade Adder is a 2-seater AWD and weighs around 1,800 KG. It doesn't have the best handling stats, but this vehicle flies when it comes to speed and acceleration. It can reach a maximum speed of 124.75 mph (200.77 km/h).

You can purchase the Adder from Legendary Motorsport for $1,000,000, and that is great value for money. You can resell the vehicle for $600,000.

2. Truffade Z-Type

Before we get to the king of the road, coming in at number two is the Truffade Z-Type which is takes after the famous 1937 Bugatti Type 57SC Atlantic's design. Z-type is a 2-seater RWD and weighs 1,000 KG. It has really good handling but below average braking and acceleration stats. At least until you install the necessary upgrades from the Los Santos Customs. But, once you get that sorted, the vehicle can reach up to 126.25 mph (203.18 km/h).

You can purchase the Truffade Z-Type from Legendary Motorsports for a colossal $10,000,000. It is also available to purchase in GTA Online for just $950,000.

1. Vapid Pißwasser Dominator

Finally, the Pißwasser variant of the Vapid Dominator takes the crown home. It is a race variant of the regular Dominator but with the Pißwasser livery on. This muscle vehicle is inspired by the real-life Ford Mustang. The Pißwasser Dominator is a 2-seater RWD and weighs 1,500 KG. It can easily reach up to 126.50 mph (203.58 km/h). Unfortunately, if you're not a returning player, the vehicle won't be available for you.

Returning players are the "OGs" who owned a copy of the game on the PS3 or Xbox 360 when it originally released. If you return to GTA 5 on the new-gen consoles (PS4, Xbox One, and PC), you will have access to a bunch of new content including the Vapid Pißwasser Dominator.

If you are a returning player, you can earn the fastest car in story mode for free. That's right. All you need to do is complete three Stock Car races. You can find the Stock Car races near Yellow Jack Inn in the Grand Senora Desert in Blaine County. These races are unlocked after you complete the mission, "Mr. Philips." Ron Jakowski will send a text message to Trevor Philips after the completion of the mission.

There are five Stock Car races, but you only need to complete three races to get the vehicle. You can also unlock several other vehicle such as the Sprunk Buffalo S, Marshall, and the Redwood Gauntlet. Any protagonist can be used to complete the races, unlike Hao's Street Races, that can only be completed using Franklin.

You will earn the vehicle after the completion of the third Stock Race. Once obtained, you can access the vehicle from any one of protagonists' garages. It'll be under 'Special Vehicles.'