I've got a Harley Road Glide with factory head unit running through a Hawg-Wired 4x75 class T amp. In the factory fairing location I can run either a 5.25 coax or separates. I also have custom speaker pods which fit in the lower fairing, approximately knee level, pointing towards the driver. There is only space for a single, coaxial, or bridged 6.5" two way speaker. Of course on the bike, with the wind and engine noise, my goals are different than with the car. I am looking to maximize decibel output while being able to withstand the weather and vibration of the bike. Looking to install a couple sets of two way speakers or go with a 6.5 three way. Thanks for your suggestions.