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The standard Mosler MT900S is a supercar by anyone's standards. It's got a sleek body made of carbon fiber, a 7.0-liter V8 with 550 horsepower, and can hit 60 mph in just over three seconds. But for one of Mosler's customers it just wasn't enough. The owner of this MT900S enlisted the help of Nelson Racing Engines in Chatsworth, CA to build the ultimate motor for his supercar: a twin-turbo 427ci V8 producing up to 1800 horsepower on race fuel and around 1100 horsepower using 91 octane. To help make the car more streetable, boost can be controlled every 100 rpm in each gear. The first few gears are limited to around 6-8 psi, while higher gears can take full boost -- over 30 psi! We recently got the chance to see the car in person at the NRE facility where they were doing final testing on the engine. The dyno run we witnessed netted nearly 1600 horsepower before the intake collapsed from the pressure. We were told that the car should be completely finished in the next couple weeks and that we could come back for a ride. We'll be sure to take them up on the offer!