you should be fine, im running kac 7204 and kac 7203 on my other car and both are bridged 500watts at 4ohm 3ohm is close enough. but if you are buying this amp i will suggest get a 2ohm stable will work better on 3ohm, you ussually want higher ohm on your sub than amp ie if you have an amp that is 4 ohm you can run 8ohm and will still be stable.