Hey there, my Grandfather's lookin into purchasing a chip for his truck to boost his HP during trips. Right now we're tryin to find a brand or product to look into as I'm not too savvy on Diesel's, and he's not too keen on the programmer/chip world! He's currently running a 2002 GMC Sierra 2500HD with the Duramax Turbo diesel (6.6L) coupled with the Allison 1000 transmission. He's already installed a Banks CAI, and redid the exhaust. We're hopin to keep the price under $600 if at all possible. We're also just lookin for a chip or module, no programmers. I really appreciate all ya'lls help!