I think if you are intending to use the stereo while driving and use open speakers then you would need a very powerful amplifier to hear the stereo, probably too loud for everyone outside the car!
I don't have a M3W but on my very loud tractor I use a pair of high spec 3M ear defenders with Apple ear buds inside. It sort of works but I can still feel the vibrations from the tractor.
I tried noise cancelling headphones (the type you get for use on aircraft) but they seemed to be tuned to aircraft type noise and did not work well with the tractor (which I assume is a similar noise to an M3W).
When using the ear defenders when I turn the music up I cannot hear anything from outside which might be a little dangerous when driving.
