Why did the Nitro 4-TEC win R/C Car Action's 1999 "Car of the Year" award? The Nitro 4-TEC combines the power of the TRX Pro .15 engine with a two-speed transmission, which is bolted on to an all-new, world-class, 4-WD chassis. It is the first RTR to break the 50mph barrier! The Nitro 4-TEC is from the company that invented the Ready-To-Run concept, Traxxas. So, you know its backed by the hobby's best customer service, parts support, and engineering excellence!