Most of the time when the radio itself has been modified for audio, a stock 636l or road king -56 is plenty alot of people overmodulate if not careful because if radio was moded for audio really a power mic is not needed. Also noticed on high power vehicles 5 pill or larger they tend to stick with non-amplified mics, i guess the power increases the audio enough. From what i noticed at the keydowns. Just my thoughts.