You don't need the EGR module right away. Tell them to install the kit and you will add the module later . Just have to turn ESP OFF before driving til you get the module installed. My buddy is running the 4 inch bds lift and doesn't even have the module on any more and doesn't have any problems. He had to take it off because we swapped in 3.73 gears and needed a hypertech speedometer calibrator to correct for the new gear ratio and you can't use both the programmer and AEV module at the same time