Like their diesel counterparts, gas-powered truck owners are always looking for ways to give their vehicles even more power and better mileage. To find out what kind of power options there are for gas-powered trucks, we went to J&D Performance in Ontario, California. We’ve seen what kind of power and performance the guys at J&D can make in a diesel-powered truck, so we figured we’d follow along as they wrenched more power out of a common gas-powered truck. After a quick phone call, we were set. The guys at J&D had a customer’s stock 1999 Ford F-350 dualie with a 6.8-liter V-10 ready for buildup. Here’s how it went.