The EGR module works 2 ways. THe first is a straight tyre size, gear ratio and other feature flash programmer. The second involves the re-tuning for want of a better word of the stability program. If you run without the EGR plugged in you have to disable the ESP via the button or the ESP program will kick an and brake wheels on most tighter corners as the extra height changes the COG and the forces that act on the sensors. I know I cannot run without the module, a simple 90 deg turn send the wheel braking mad and slow the Jeep to a crawl before letting it continue. With the module, i need to treat it like i stole it to get the same result, which is how it should be.

I know a couple of others have gotten away without the EGR, but i have never been able to. I know I have the GDE and EGR working with no problem on each other, but the GDE is a totally different type of tune.