Have HP Tuners but don’t know where to start? Let us build you a file. Your gains will depend on the modifications that you have done to your vehicle, but generally we are able to pick up 10-14hp on the 4.2L I6’s and 15-20+hp on the V8 models, along with better gas mileage and driveability. (2002-2005 4.2L year models: we are not able to make speedometer corrections or remove park/neutral rev limiter). After placing your order, please click on “Ordersheet” on the top menu and fill out a tuning ordersheet for your vehicle. Then, email a copy of your STOCK file to firstname.lastname@example.org for tuning! NOTE: The cost of the email tune includes three free revisions (based off of datalogs you submit). Every file revision/review after the intial three is $5/file. Future reflashes are $50 (if you add/delete modifications).