The KTM X-Bow carries so little weight – the skeletal X-Bow R weighs just 790kg dry – that it slingshots to 60 mph in under 4 seconds. No windscreen, No radio. No windows. No doors. Really fast! The KTM X-Bow R is powered by the 300 horsepower version of the turbocharged 2.0-liter TFSI Audi engine sourced from the S3.