Like I said before,, and again. Tune it yourself and save the $$ it will cost for some one to do the same thing. Order the HP on line and read the instructions. It is a hand held computer that plugs into your computer under the dash. Then you can dial in what you want and change what you don't. If and when you descide to sell the auto,, you can down load the program back into the tuner and reinstall the factory one into the auto. As long as the program is the same for each. I have 5 do to the fact it was for 5 different cars. Can be sold and changed to a persons preference. Timing, gears shiftings, rear end, ect.