I would think those horns will overpower your front stage. Also I'm not a fan of those amps, Rockford has some nice stuff but not those. If you want to run horns I would suggest some different speaks for the fairing (prob some PA's like MMats, or PRV's), drop the MM's in the lowers, and a better amp (depending on budget anything from a Soundstream TN4.900D, Arc Moto 600.4 etc.)
2007 SB Stage 1, PCV, 30/70 swap, fabbed fenders, w/ quick release bags fairing and tour pack, lots of powder, flake and marbled paint.
2008 Road Glide - Stage 1, added lowers and Tour Pak, and upgraded audio.