Gerald
Enthusiast
With the amp in question (doesn't seem like mega power) it looks like you wouldn't be sacraficing any power or quality by keeping the stock lead from the battery. On the other hand, if your running a pair of 10's 12's or 15's, etc. with like 300 watts going to each speaker, then you would definatley want new wiring with very thick gage all the way around..
Gerald
Gerald