I just got done installing the kicker amp and speaker upgrade. I installed the amp for my 2013 JKUR, I think model number 77kck056. Also installed the four kicker 6.5" speakers in dash and soundbar. My initial impressions are that this is a superior upgrade to the alpine system. The speakers sound much cleaner and there is a very noticeable increase in volume, they get loud and stay clear. They are much better when the top is off. I wasn't sure how much of a difference I would hear, but I would say that it is a significant improvement. I purchased the amp and speakers from justforjeeps.com. Arrived super quick and prices were great. I also installed the mopar sub and separate amp, a nice improvement over stock as well, much better bass, still tweaking things, but I am very happy with this setup! I would recommend and the install was plug and play except for the sub amp which taps off of speaker inputs up front for the signal.