I installed a chip yesterday and it made a world of difference!! I can smoke the 275/18's through 2nd gear from a rolling start..The hp and torque increase feels really good..The guy that made it claims 20-30hp and 40lbs of tq. at the rear wheels..Dont have a dyno in the area but it sure feels stronger..If anybody is interested in them they sell for 300.00 bucks..I dont know if thats cheap or high but it was free for me, so I love it..We sell a lot of his chips for the Ford diesel trucks and have had real good luck for the last 2 yrs..