ORIGINAL: SOILWORK
I dont like to use aluminum. If you crash, somthing needs to give and asorb the shock or impact. Its a lot cheaper to replace plastic than it is to replace twisted aluminum. Aluminum is good for shelf queens and looks, but that's just my two cents
It depends on the part. For instance, the LST 1 came with plastic differential covers which split easily under load. Going to aluminum fixes the problem. There are many examples of where going to aluminum, or some other metal, is better than sticking with a stock plastic part. You just have to take into consideration the impact factor, as has been previously explained.