Well, visit http://www.bankspower.com/
Banks Power makes combination packages (packs) for most truck engines from light trucks to full blown semis, These packages are made for both gas and diesel engines, and consist of most every part, external to the engine block which has air or exhaust passing through it, Intake, air cleaner, Intake manafold, exhaust headers, pipes, muffler and resonator, and tail pipe are all included in a full banks power kit
They also have the OTTOMIND which is an updated electronics controller
The combination can add to both horsepower and millage... Kind of like a no-moving-parts-to-wear-out turbo charger