I want to upgrade my 2014 “premium” sound system. I have done the tweeter mod, poly-fil and put Infinity speakers in the sound bar. I’m still not happy with the sound. I have the 130 head unit and I’m looking into replacing it with an aftermarket unit. I read that if I replace the head unit I should take out the factory amp and replace everything. Is this the general consensus? I don’t want to spend a bunch of money if it’s not going to improve the sound.