KTM isn't waiting for rivals Ariel and Caterham to catch up to its track day special X-Bow racer. The original X-Bow is still not yet availalbe to purchase until the end of year, but KTM is already planning a more powerful version using the 2.0 TFSI engine found in the Audi S3. That motor makes 265 hp in the S3 thanks to larger injectors and intercoolers, but Autocar expects it will be producing around 280 hp when stuffed in the X-Bow. The regular X-Bow will still be powered by a version of the Audi/VW 2.0 TFSI producing 220 hp. Considering that KTM claims the less powerful motor will get the X-Bow to 60 mph in 3.9 seconds, the S3's mill should make the car capable of sucking the enamel off your teeth.