I would recommend using a good quaility brand 4ga amp kit if dont have one already. make sure you get the right fuse rating also.Internet has pretty good 4ga kits for a decent price. plus if plan to upgrade in the future you will still probably be able to use the same wire size unless you want alot more powerful equipment.
I dont no what bazooka amp you have but I can bet it isnt running at 500 wrms so see at a stereo store if 4ga will fit in the power terminals. Might fit 8ga wire better