Banks had two options for these IDI's. The "Power Pack" and their "Sidewinder Turbo". They don't sell the power pack anymore as far as I know. I have the power pack on the crew cab F350. It came with a complete exhaust system and this larger, better flowing lid for the air box along with a larger K&N style paper filter. They also gave you a pyrometer and instructions on how to turn up the fuel a bit on the IP.
Heath