the fusion 4000d's are a good amp if u can find someone who has them.. there stable down to .33 ohm and they out power the t-4000's no to mention the stability at a lower ohm load. i currently have 3 of them and i cant be more impressed with them... there is some info on there out put on the web. at .33 ohm they have been tested at over 8k rms.... and there prices is cheep for the power output... just fyi