Breaking parts is part of racing. If you hit the wall at 15-20 mph do you realy think that the car shouldn'g break? If you do, I'd like to suggest that you go out on your bike or car and hit something at that speed and see what happens.
I've read on this tread how guys are spending tons of money on aluminum this or that and ceramic bearings... give me a break, no one made you buy these parts, you bought them of your own free will.
For those of you who have spent large sums of money on aluminum, ceramic this or that, ask youself, did it improve your ability to drive the car, did you really notice a performance difference? Most likely not. Try practice and lots of it, that in the end will make you a better driver.
Just my .02 cents and venting....
E