OK, so my cousin and I have decided our next trucks will be diesel's. He wants short bed, Im thinking crew cab long bed. The reasons are more power, longevity/durability, and increased milage. Im kinda new to oil burners and have a few questions since last time I delt with one they were slow and spewed black smoke. Can I really make an extra 125 HP and 250 ft/lbs. torque by bolting on an exhaust kit, adding an air intake, and using a tuner/chip? What do you people do to make near 500 HP and 800-900 pounds torque? What type of mileage do you get? And does it spew black smoke? I want to add power with "bolt ons" and not add stuff like propane injection. We dont plan to haul 18,000 pounds just a boat to the lake, maybe a camper, and a horse or two. Thanks!! Also if anyone could recomend a good place to read up on diesels. How they work, best ways to add power, increase mileage, etc.