this happened to me in my RS4 3 SS, my battery pack fell out, and at full throttle heading staright for a parking curb, neddless to say that was the end of that car, the body was broken at the wheel wells, the whole front suspension broke and the shaft drive pussed back in my tranny and strippedthe screws, needless to say its now my brothers parts car, frame bent, they rated the .18ss at about 50mph+ and i dont know how fast it was going but had about 100 feet to get max speed... so ever since got a return spring and man it works great there only $7-8 froma hobby shop, and well worth it, cause that accident cost me a $1000(only cause i went and bought a brand new R40HE with Picco Red dot engine ) which is much more fun ...