Well obviously anything within the normal range of ported and sealed, but beyond that I always put lettering, lighting, fiberglass, or whatever idea's i have into box's. You should IM me @mgaidica sometime Jmac, i'll show ya what im talking about //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif. that goes for anyone also, my webpage will be up soon...