i have enough room for both i have already torn out my back seat and have about 16 cubic ft in the back of my extended cab truck . power wise i was going to use the soundstream for the rl-s cause there rated 1100 @ 4ohms but if theres another amp that will do better im up for suggestions . As for competeing im not sure as of yet i want to but not realy sure. i do want to get crazy loud but i do still want a little sq.