QuickPickemup

Hello, well I have a 2006 chev 2500HD with an 8.1 and the allison and after lots of pondering I dont want to lift this truck I want to turn it into a streeter. I have been looking at STS systems and talked to a sales/tech guy and he said they make a system for my truck that will put it at 1000hp. Anyway before I jump into that 10,000$ project I would very much appreciate any advice on maybe where I should start and what kind of mods I should get before I get that system. My truck is completely stock and it now has 44k miles on it Ive put 30k on it since I bought it and they are pretty gentle miles I havent towed anything or run it hard at all as I take care of my stuff BUT I love having horsepower on tap. I have looked around ALOT and seems mods for this engine are not as plentiful as I may have thought so any advice or pointers you all have would be very much appreciated.

Thank you all and thanks for your help