1. Bugatti Chiron Super Sport 300+:
The Bugatti Chiron Super Sport 300+ held the title as the fastest car in 2021, with a top speed of 304 mph (490 km/h).
2. Hennessey Venom F5:
The Hennessey Venom F5 was designed to reach speeds exceeding 300 mph and was a strong contender in the fastest car category.
3. Koenigsegg Jesko:
The Koenigsegg Jesko is capable of reaching speeds up to 300 mph and is one of the most powerful production cars in the world.
4. Rimac C_Two:
The Rimac C_Two is an all-electric hypercar that can accelerate from 0 to 60 mph in just 1.85 seconds and has a top speed of around 258 mph.
5. SSC Tuatara:
The SSC Tuatara is another contender for the fastest car title, with a claimed top speed of 282.9 mph.
6. Rimac C_Two:
Another Rimac C_Two with a different configuration was capable of reaching top speeds of around 258 mph.
7. Lamborghini Aventador SVJ:
The Lamborghini Aventador SVJ was one of the fastest production Lamborghinis in 2021, with a top speed of approximately 217 mph.
8. Porsche 911 GT2 RS:
The Porsche 911 GT2 RS was one of the fastest 911 models with a top speed of around 211 mph.
9. McLaren Senna:
The McLaren Senna was a track-focused hypercar capable of reaching top speeds of about 208 mph.
10. Ferrari 812 Superfast:
The Ferrari 812 Superfast was one of the fastest production Ferraris with a top speed of around 211 mph.
Please note that these speeds are approximate, and actual performance can vary depending on various factors such as road conditions and specific configurations of the cars. Additionally, new models may have been introduced since my last knowledge update in September 2021, so I recommend checking the latest sources for the most up-to-date information on the fastest cars in the world.