Well I don't know how far that 8 gauge wire is run, but unless it's around a foot yes you should have a thicker wire. If it was mine I'd replace it even at a short distance. The difference it will actually make may or may not be too apparent. I would replace it more for safety then anything. If it's a long wire run though I'd bet you do notice a difference.
(Message edited by calvolson on February 23, 2010)