The hp rating will be different on each truck. You need to add more fuel, alot more fuel if all you plan to use is your BDII's listed. The hp gained will be directly related to how much excess fuel you have. Nitrous would help with turbo lag (if any) and cool down your tempertures, but will not net you a big gain (100+).
With the right fueling typical gains are 175 to 250hp.