Mosler Automotive
Product brand
UnclaimedMosler Automotive was an American manufacturer of lightweight, high-performance sports cars and racing vehicles.
Last updated August 24, 2026
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Overview
Mosler Automotive was an American specialist sports-car and racing-car manufacturer headquartered in Riviera Beach, Florida. The company emerged from Consulier Industries, which Warren Mosler founded in 1985. Consulier's principal automotive product was the Consulier GTP, an unusually light mid-engined sports car built around a fiberglass-and-foam monocoque and powered initially by a turbocharged Chrysler four-cylinder engine. In 1993, Consulier Industries separated its automotive activities into Mosler Automotive, creating a distinct marque focused on low-volume performance cars and competition vehicles. Mosler's first major products were evolutions of the Consulier concept. The Intruder replaced the earlier car's bodywork and engine, using a General Motors LT1 V8 and substantially greater power. Its competition success quickly established the company as an unconventional but serious performance specialist. The Intruder won its class at the 24 Hours of Nelson Ledges in consecutive years, although its dominance contributed to its subsequent exclusion from that event. A Lingenfelter Performance Engineering-modified Intruder also won Car and Driver's One Lap of America multiple times before being barred from further competition. In 1997, aerodynamic revisions and a V-shaped windshield led to the car being renamed the Raptor; the Raptor continued Mosler's success in One Lap competition, including victories in 1997 and 1999. Mosler then moved to a new platform with the MT900, introduced in 2001. The MT900 used a carbon-fiber chassis, rear-wheel drive, a mid-mounted General Motors LS-series V8, and computer-assisted design methods. Its engineering emphasized low mass, acceleration, and track performance rather than luxury-car refinement or large-scale production. The road-going MT900S developed into the company's principal street-legal offering, while the MT900R served as a dedicated racing derivative. A particularly lightweight Photon version of the MT900S incorporated competition-oriented components such as a Hewland transmission, magnesium wheels, titanium springs, carbon-fiber seats, and additional carbon-fiber bodywork. The MT900R competed successfully in North American and European events. Its results included a GTS-class victory at the 2003 Rolex 24 at Daytona and participation or wins in series and races associated with British GT, FIA GT, the International Open GT Championship, Britcar, and Spanish GT competition. Mosler also supported a one-make Dutch Supercar Challenge series for the MT900R, which began in 2008 at the Nürburgring. Beyond its principal models, the company developed several unusual one-off or project vehicles, including the six-wheel J-10 Sport and the Cadillac-based TwinStar, which used two Northstar V8 engines. Other listed projects included the GT300, GT600, and Land Shark. Mosler's products remained rare and highly specialized, combining exotic-car performance with race-car engineering and unconventional construction. The company did not develop into a high-volume manufacturer. In June 2013, Mosler Automotive ceased operations, and its assets were acquired by Rossion Automotive. Its legacy rests primarily on the lightweight Consulier and Mosler platforms, their competition record, and the MT900's status as an American low-volume supercar.
History
Mosler Automotive's roots lay in Consulier Industries, founded by Warren Mosler in 1985. Consulier introduced the GTP, a lightweight, mid-engined sports car whose structure used a fiberglass-and-foam monocoque rather than a conventional steel chassis. The original car weighed approximately 2,200 pounds and used a turbocharged 2.2-liter Chrysler engine. Its construction philosophy anticipated the later Mosler emphasis on minimizing mass as a route to acceleration, handling, and braking performance. In 1993, Consulier Industries spun off its automotive division as Mosler Automotive. The new company developed the Intruder, a rebodied and more powerful successor to the GTP. It used a General Motors LT1 V8 rated at approximately 300 horsepower. The Intruder performed strongly in endurance and time-based competition, winning its class at the 24 Hours of Nelson Ledges in successive years. Its dominance led to a ban from that competition. A further Intruder prepared by Lingenfelter Performance Engineering produced approximately 450 horsepower and won Car and Driver's One Lap of America three times before also being excluded from the event. The Intruder evolved into the Raptor in 1997. The redesign included a V-shaped windshield intended to reduce aerodynamic drag. A competition Raptor weighed about 2,773 pounds and used a Lingenfelter-modified 6.3-liter V8 producing roughly 443 horsepower. It won the 1997 and 1999 One Lap of America events, continuing the marque's pattern of success in competitions where acceleration, braking, and handling were decisive. Mosler introduced an entirely new platform, the MT900, in 2001. Designed with Siemens advanced design software, it featured a carbon-fiber chassis, rear-wheel drive, a mid-mounted GM LS1 V8, and a target architecture suited to both road and track use. The production MT900S subsequently used a Corvette Z06-derived LS-6 V8 rated at approximately 435 horsepower and combined it with a very low curb mass. A Photon variant reduced mass further through the use of a Hewland transmission, BBS magnesium wheels, titanium springs, carbon-fiber seats, and carbon-fiber bodywork. Contemporary testing reported exceptionally rapid acceleration and braking, although the test car was later found to have an oxygen-sensor fault that affected its engine output. The racing version, the MT900R, became one of Mosler's most important products. It won the GTS division of the 2003 Rolex 24 at Daytona and competed in a range of European GT events, including British GT, FIA GT-related races, the International Open GT Championship, Britcar, and Spanish GT competition. In 2008, the company was associated with a Dutch Supercar Challenge series dedicated to MT900R cars. Mosler also pursued limited engineering projects outside its principal model range. These included the six-wheel J-10 Sport, which incorporated many General Motors components, and the TwinStar, a Cadillac Eldorado conversion equipped with two Northstar V8 engines. Catalogued or proposed variants also included the GT300, GT600, and Land Shark. The business remained a niche manufacturer and did not achieve the production scale of mainstream sports-car companies. Mosler Automotive ceased operations in June 2013, when Rossion Automotive acquired its assets. The company is consequently remembered as a short-lived but technically distinctive American constructor whose cars combined composite structures, powerful American engines, and strong circuit-racing ambitions.
- 2013
Operations end and assets are acquired
[1]Mosler Automotive ceases operations in June, with its assets acquired by Rossion Automotive.
- 2008
MT900R one-make series launches
[1]The Mosler Dutch Supercar Challenge, an MT900R-only race series, holds its first event at the Nürburgring.
- 2005
MT900S development advances
[1]The MT900S is described with a Corvette Z06-derived LS-6 V8, while the lightweight Photon specification adds competition-focused components.
- 2003
MT900R wins at Daytona
[1]The MT900R wins the GTS division of the Rolex 24 Hours at Daytona.
- 2001
MT900 debuts
[1]Mosler introduces its carbon-fiber MT900 platform with a mid-mounted LS1 V8 and a design intended for both road and racing development.
- 1997
Intruder evolves into the Raptor
[1]Aerodynamic revisions, including a V-shaped windshield, accompany the renaming of the Intruder as the Raptor.
- 1993
Mosler Automotive is spun off
[1]Consulier Industries separates its automotive division and establishes Mosler Automotive as the operating marque.
- 1993
Intruder wins at Nelson Ledges
[1]The Intruder begins a run of endurance-racing success, winning its class at the 24 Hours of Nelson Ledges in consecutive years.
- 1985
Consulier Industries is founded
[1]Warren Mosler establishes Consulier Industries, the company from which Mosler Automotive's automotive operations later emerge.
- 1985
Consulier GTP is introduced
[1]The company presents a lightweight mid-engined sports car using a fiberglass-and-foam monocoque and a turbocharged Chrysler engine.
Products and positioning
A low-volume American performance marque focused on extreme light weight, high power-to-weight ratios, unconventional engineering, and competition-derived sports cars.
Sports car · 1985
Consulier GTP
The Consulier GTP was the lightweight sports car that established the company's engineering direction. It used a mid-mounted turbocharged 2.2-liter Chrysler engine and a fiberglass-and-foam monocoque weighing about 2,200 pounds. The model preceded the formal creation of Mosler Automotive but became the basis for the later Intruder and Raptor.
Sports car and race car · 1993
Mosler Intruder
The Intruder was a rebodied development of the Consulier concept introduced after the automotive division became Mosler Automotive. It replaced the earlier powertrain with a General Motors LT1 V8 producing about 300 horsepower. Its endurance-racing victories and later competition exclusions made it one of the company's best-known early performance cars.
Sports car and race car · 1997
Mosler Raptor
The Raptor was the aerodynamic successor to the Intruder. Its V-shaped windshield was intended to reduce drag, while competition examples received highly modified V8 engines and achieved a very high power-to-weight ratio. The model won the One Lap of America in 1997 and 1999.
Sports car platform · 2001
Mosler MT900
The MT900 was Mosler's new-generation carbon-fiber sports-car platform. It used rear-wheel drive, a mid-mounted General Motors LS1 V8, and computer-assisted design. The platform supported both the street-legal MT900S and the competition-focused MT900R.
Street-legal supercar · 2001
Mosler MT900S
The MT900S was the road-going version of the MT900 platform. Later examples used a Corvette Z06-derived LS-6 V8 producing approximately 435 horsepower in a car weighing about 2,500 pounds before fuel. The model prioritized acceleration and low mass over luxury equipment or high-volume production.
Lightweight supercar variant · 2005
Mosler MT900S Photon
The Photon was an especially lightweight MT900S specification. Its equipment included a Hewland transmission, BBS magnesium wheels, titanium springs, carbon-fiber seats, and carbon-fiber bodywork. These changes reduced mass to approximately 1,980 pounds and emphasized track-oriented performance.
Race car · 2001
Mosler MT900R
The MT900R was the competition version of the MT900. It achieved a GTS-class victory at the 2003 Rolex 24 at Daytona and competed across North American and European GT events. The car also formed the basis of an MT900R-only Dutch Supercar Challenge series launched in 2008.
Project vehicle
Mosler J-10 Sport
The J-10 Sport was a one-off six-wheel custom vehicle that used numerous General Motors components. It represented Mosler's willingness to explore unusual engineering projects beyond conventional two-axle sports cars.
Project vehicle
Mosler TwinStar
The TwinStar was a Cadillac Eldorado-based project vehicle fitted with twin Northstar V8 engines. It was an experimental showcase rather than a regular production model.
Sports car project
Mosler GT300
The GT300 is listed among Mosler's additional model and project designations. Available reference material identifies the name but does not provide sufficient specifications or production details.
Sports car project
Mosler GT600
The GT600 is listed among Mosler's additional model and project designations. The available material does not establish whether it entered series production or provide reliable technical specifications.
Sports car project
Mosler Land Shark
The Land Shark is listed as a Mosler model or project name, but the available reference material does not provide enough information to characterize its engineering or production status.
Brand decisions
2013
Transfer assets to Rossion AutomotiveM&ABackground
Mosler Automotive remained a small specialist manufacturer and ended its independent operations in June 2013.
Action taken
Rossion Automotive acquired the company's assets.
Aftermath
Mosler ceased to operate as an independent automotive manufacturer, although its engineering and product legacy continued through the acquired assets.
2005
Develop the MT900S Photon specificationGeneration changeBackground
Mosler's performance proposition depended heavily on reducing mass, and the MT900 platform was suitable for a more extreme lightweight version.
Action taken
The Photon specification added competition-oriented components including a Hewland transmission, magnesium wheels, titanium springs, and extensive carbon-fiber parts.
Aftermath
The resulting car further emphasized track performance and achieved a substantially lower stated mass than the regular MT900S.
2001
Introduce the MT900 platformProduct launchBackground
After the Intruder and Raptor, Mosler required a newer architecture capable of supporting both road and racing applications.
Action taken
The company introduced a carbon-fiber, rear-wheel-drive sports-car platform with a mid-mounted GM LS1 V8, later developing it into the MT900S and MT900R.
Aftermath
The MT900 became Mosler's defining product family and produced the company's most visible road-car and racing achievements.
1993
Separate the automotive division as Mosler AutomotiveStrategyBackground
Consulier Industries had developed the GTP as a specialist performance car, but the automotive operation was separated from the parent company's other activities.
Action taken
The automotive division was spun off under the Mosler Automotive name, allowing it to develop the Intruder, Raptor, and later MT900 family as a distinct marque.
Aftermath
The change established the Mosler identity and focused the business on low-volume sports cars and racing vehicles.
Sources2 sources
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