as long as yer amp has terminals that accept 4ga wire. and yes, 8ga is probably the minimum for that amp. better to go as small guage as possible(for upgrades later ;-)
can never have too big of wire expessially ground always have the same if not larger wire for your ground if your runnin 4ga power wire use at least 4ga ground or 2ga it isnt a have to do thing just some recomend it (if ur kit comes with 4ga dont go buy a seperate 2ga! it isnt that big of a deal but if your buying wires seperate)