Originally Posted by
gas-man
why use the plastic instead?
Plastic will flex long before it fails, as wher alum won't. While the aluminum is "stronger / stiffer" it is hard to tell if it is about to fail.. But when your EPA's are set correctly with no binding I have yet to see an arm of either style fail.. but if the EPA is set to far causing a bind issue the aluminum will fail before the plastic, due to the added flexability in the plastic..
BTW alum may give slightly better responce due to added rigidity, but in off-road it isn't really noticed..