I have a 2004. 5 Cummins 600 and would like to find an installer or full service garage to get me into the 550+ horsepower and 1100ft/lbs torque catagory and would likely need to upgrade/replace auto trans to a stonger and hopefully quicker shifting model. Any other mods that would be smart to do I would also want done. I hope to find a relialbe place (in the Chicago area but will transport anywhere for pro service) to take care of the mods from start to finish in a reasonable time. Anyone have any ideas on dealers and or products? Quick turbo spool up and performance in traffic are important.