Traxxas Stability Management, introduced by the company in 2015, acts as an invisible co-pilot to give you intuitive control of the Slash VXL. TSM will constantly measure the attitude of the vehicle and make corrections to keep your Slash pointing in the direction you want it to go at blistering speeds. And thanks to the Velineon 3500 brushless motor, the vehicle can hit out-of-box speeds of up to 40 miles per hour with the included 4,200-megahertz Series 4 7-cell battery pack. This power truly comes alive with the OBA, which works proportionally with the speed controller so that the engine revs in tandem with the speed of the vehicle. There’s even a launch/burnout setting. Simply flip a switch, and the audio system will begin revving while the vehicle is stationary. Flip the switch again to set the tires in motion, spinning and revving wildly.