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A weapon for the track, but legal for the street, the X-Bow was developed by motorcycle manufacturer KTM to be a pure performance machine. The R version brings an additional 60 horsepower to bear; to accommodate the power increase, the torque arm was lowered. A beneficial side effect of doing so was a lowered center of gravity. Add to the package stiffer springs and friction-reducing Teflon washers and the X-Bow is in its own realm of cornering ability. Deadly accuracy in the turns combined with bullet-fast acceleration have made the X-Bow a choice car for the Race of Champions but, for any mere mortal driver, it has more ability than most will ever tap. This means it is a perfect car for pushing your driving limits. Powered by a 2.0 liter Audi four-cylinder and available solely as a six-speed manual, the X-Bow requires nothing more than a driver to begin hunting for incredible track times.
— Official description
The 2013 KTM X-Bow R is an ultralight sports car by KTM that appears in all main titles of the Forza series since Forza Motorsport 5.
The X-Bow R was designed by motorcycle manufacturer KTM in cooperation with Dallara, a racing car manufacturer specialized in Formula racing. The X-Bow R was introduced in 2011 as the top-of-the-line sports car by KTM and is powered by an Audi two litre turbo engine raised to 295 hp (220 kW).
The X-Bow R is built on a carbon fiber monocoque with pushrod suspension and Brembo racing brakes. It weighs 1786 lb (810 kg), which makes it heavier than most ultralight sports cars, but also has a more rear-biased weight distribution than its class rivals for improved turn-in steering.
The X-Bow R has a mid-mounted EA 113 codenamed turbo engine with 295 hp (220 kW) at 6300 rpm and 295 ft·lb (400 N·m) of torque at 4000 rpm that is mated to a manual clutch six-speed transmission.
The X-Bow R has strong handling characteristics thanks to an extremely light steering and balanced chassis. Although it only requires 6.5 seconds when going from 0 to 100 mph (161 km/h), it does lag behind other high-performance ultralight cars such as the BAC Mono when launching to 60 mph (97 km/h), which takes four seconds for the KTM. Another weak point is top speed, as it already hits 144 mph (232 km/h) as maximum, making the X-Bow R a better choice for tracks focused on handling.