The single biggest thing would probably be the tire size change, for guys who don't have annother tuner like my xrt, don't have the ability to get the speedo even close if they have EFI alone.
Cheapest extended warranty there is. Adjust tire size so at 60 speedo reads 30. Easy to remember and doubles warranty. I don't need the speedo at all. Read my speed off the GPS system.
Stealthy Dodge 07.5 2500 2wd with lots of torque multiplying assistance, and now EFI Live tuning.