im looking into gettin a DP F5 multi-position chip for my soon coming 99 powerstroke4x4 automatic. before i actually go out and buy this i just want to learn a little bit more about it so i figured id ask you My first question is does the chip have to be specailly tuned to my truck or can i just order the chip with the three settings i choose? im going to get the 80 hp economy, 100 hp race, and im not sure to get the 140 extreme, or 140 hp agressive. can anyone explain the difference. also, is the estimated horsepower they are claiming added to the rear wheels or just the flywheel. 140 hp to the rear wheels from a chip seems like alot but u guys know better then me. also, is this chip adjustable while driving, can i change the position while im driving? if you guys could give me all the info you have on DP tuners that would be awesome. im really loving this website you guys are great!