J.W. Speaker GMC Sierra Parts

Like many of America’s best aftermarket part companies, JMS Automotive Products was founded by avid fans of performance vehicles, and has now grown into a highly professional supplier of 1999-2017 engine parts. JMS’s leading products are a series of throttle enhancers, including the PedalMax. These enhancers aim to eliminate the throttle, turbo, and pedal lag found in modern drive-by-wire vehicles. With these 1999-2017 throttle enhancements in place, your Sierra will jump off the starting line with new vigor, and respond powerfully to your inputs with the throttle and controls. JMS makes these plug-and-play components with a remote control knob also, giving you the option to dial in fine-tuning to throttle response and other parameters on the fly. These electronic parts qualify for the free shipping that American Trucks offers on all orders of $75 or more, too, giving you more bang for your buck and more money for your next upgrade.