The HU itself generally have speaker power outputs of up to 60watts (25Watts RMS per channel) and u can run, for example 200watts speakers but not at their peak, if im making sense. They will sound ok u just can't blast them as much. By having the amp, it helps support the watts of your speaker and make them sound alot better. I suggest investing in one. Yes i am lookin at a K&N cold intake but not sure yet if it's worth it as i only have an ek1. I gota look into the Buddy club rims, they sound aite.