I did put the Polk speakers in an it sounded better....added the sound stream amp an it helped too but the speakers aren't living up to the amp (my guess) it sounds decent an I can live with it but eventually I'll throw some infinity Kapa's in there. I saw a thread about cutting the speaker enclosures open...been thinking about that too.

 

I would look around the forum, I had those same Polks a few bikes ago and while they sounded good they couldn't produce the sound level needed at speed. My game plan is to run the Euphoria EDC6K's off of the Cerwin B52. If you don't want the separate tweeter then Gypsie posted up video's of the DB Drive WDX6MOTO's and also a pair of Sony's. These might be good to look at.