Have you installed an MP3 player, Satellite Radio, portable CD player and found noise through the stereo that did not previously exist?
The Power Noise Filter is designed to remove AC ripple. Generally, they are not very effective by themselves, but have shown to improve the effectiveness of our Ground Loop Isolators.
Universal hard wire; positive input, positive output and ground. Also available is a Honda GL1800 / F6B version that plugs in-between the connectors for the Power Outlet in the left pocket.