Pretty bike; but an unaswerable question w/o more information from you.
Simple answer is HD's accessory kit (~$1900+) that replicates the SESG3 (two amps, speakers in fairing, vented fairing lowers, and saddlebag lids and tweeters in two 2" fairing gauge holes--it's on the HD website.)
You'lll replace your moustache engine guard and buy vented lowers and saddlebag lids.
So, how much are you willing to spend?
Are you willing to replace the moustache engine guard; install a standard engine guard; and, install vented fairing lowers to accommodate speakers?
Are you willing to give up nominal space in the saddlebags (to mount speakers in the lids) or significant space to mount an amp/speakers in the saddlebag bottoms?
Are you willing to install an amp in a tour pak--detachable or permanently mounted--or saddlebag?
One of this forum's most knowledgeable members on audio questions is TIF2; shoot him a PM--he'll be very helpful.
Carl