I was one of the two that created the rally car. Just bored one day at track, spare car in hand, and watching the HPI rally cars run around.
The car is pretty good, with the right setup! Jumps VERY flat, has good traction, yet will still allow you to drift through the sweepers.
Corse-R. The steering rack cover. If yer creative, you can take a VERY thin piece of lexan and make one. Associated formed a couple for us to test, and they worked REALLY good, but, decided against it. Something else in the works. The gear cover. Again, lexan to the rescue. Cut a piece that is slightly larger than the opening on the bottom of the car. You will also need 2 2mm shims. Shoo Goo the lexan to the bottom of the car, over the opening for the gear. Take your 2 2mm shims and wedge them under the lexan, lifting the lexan up and forming a little scoop. MAKE SURE THE SCOOP IS FACING TOWARDS THE BACK OF THE CAR!!!! What you are forming is a small cover. The shims are there to allow and debris that enters the car from the top to be expelled out the bottom. We tried this on our cars and it worked great!!!!! You will lose 2mm of ground clearance near the back of the car, but it's not that big a deal...
Let me know how this worked for ya...