i have the basslink II installed, i've had 0 issues with it. I chose to for its compact size and moderate power output. as for splicing into the factory wiring harness, i taped off the 8" door subs which to me worked really well. i already installed a alpine amp and infinity speakers all around and those too work excellent with the factory nav.
ford did a really good job make sure owners can I.D. the speaker wiring, its the only set of wires in the truck that are twisted together.
2012 mustang kona 3.7, manual, Performance Pack, MCA,procharger 8lb pulley, detchwreks injectors, MRT Axle-back exhaust, blowfish bracket, steeda sport springs, koni str-t, bmr phb, mgw shifter infinity speakers, bass-link ii, alpine amp