Want to add .02 to the raised diff height discussion. There are several of us that have been talking about it lately, including a few pro racers, since the Serpent Cobra GT 3.0 has the option to install spacers to raise the diffs front, rear or both by 5mm. The GT8 class are buggy based so lowering the car for onroad racing increases the arm and axle angles upward. Installing the diff spacers brings them back level while keeping the chassis low to the ground and in onroad form. This also affects the RC and CG of course. Once I get my new Cobra GT I'm going to take all the measurements for factory kit and then save a different file with the added diff spacer height so the difference can be seen and played with.