|Here are two things you should know about the Mosler MT900S: it looks like a road-going spacecraft, and the first one ever built was snapped up by filmmaker George Lucas. Coincidence? Mosler Automotive has always done things a little bit differently. They created a Cadillac Eldorado with two engines called the TwinStar, and also constructed the amazing Consulier GTP, which was tremendously ugly but won so often in IMSA Supercar races that it was banned by the series organizers. The MT900S isn’t ugly and only has one engine, but what’s different about it is the utilization of a host of high-tech materials optimized for the lightest possible curb weight. For example, power steering was deemed too heavy by the design team, so it’s not available. Mosler pairs the resulting chassis with a 530 horsepower V8 pulled straight out of the latest Corvette Z06, which is plenty to motivate the bantam-weight MT900S. It was also designed differently, created by Rod Trenne entirely with computer-drafting software using no clay models or concept art to guide the process. This latest MT900S has also benefitted from the numerous lessons learned from its competition-only cousin, the MT900R, class winner at the Daytona 24-hour endurance race. The MT900S is truly a result of Warren Mosler’s singular vision about how a car should be constructed: differently, but for optimal performance.|
— Official description 
Unlock in Forza Horizon 4
It has been made unlockable during one season and one full series, but was also gifted to all players on January 1, 2019 due to a bug that prevented some players from unlocking the car:
- Seasonal Championship reward - Series 4 Autumn Season
- 80% Series Completion Bonus - Series 12
The Mosler MT900S is powerred by a Chevrolet Corvette Z06-derived 7,011 cc (7 liter) LS7 V8 with a supercharger, increasing power to 600 hp (447 kW) and torque to 515 ft·lb (698 N·m). It uses a mid-engine, rear-wheel drive layout and a six-speed manual gearbox.
The MT900S can do 0 to 60 mph (97 km/h) in 3.1 seconds and reach a top speed at around the 200 mph (322 km/h) mark in Xbox 360 titles, which was increased to 211 mph (340 km/h) in Forza Horizon 4. Given its light mid-engine chassis that weighs 2480 lb (1125 kg), the MT900S has above-average handling.
Requires the Exotic Cars Pack
Purchase from the car dealer for 320,000 CR
Performance & Body Style
Top Speed: 196.9 mph (316.8 km/h)
0-60 mph (0-97 km/h): 3.130 secs.
0-100 mph (0-161 km/h): 7.110 secs.
60-0 mph (97-0 km/h): 105.5 ft (32.2 m)
100-0 mph (161-0 km/h): 258.3 ft (78.7 m)
60 mph (97 km/h): 1.23 g
120 mph (193 km/h): 1.57 g
A "Hard-to-Find" vehicle that can not be purchased from the Autoshow
Performance & Car Type
Extreme Track Toys
Value: 320,000 CR
Top Speed: 211.0 mph (339.5 km/h)
0-60 mph (0-97 km/h): 3.490 secs.
0-100 mph (0-161 km/h): 6.720 secs.
60-0 mph (97-0 km/h): 95.4 ft (29.1 m)
100-0 mph (161-0 km/h): 216.9 ft (66.1 m)
60 mph (97 km/h): 1.56 g
120 mph (193 km/h): 2.06 g
|Conversion - Engine|
Racing 7.2L V8
|Conversion - Drivetrain|
|Conversion - Aspiration|
- The MT900S derives its name from (Warren) Mosler, (Rod) Trenne, and the car's 900 kilogram (1,984 lbs) target weight.