That Kicker amp is designed for JK's with the base sound system, not as an upgrade for the Infinity system.
If you're looking for an upgrade and improve the soundbar sound a Nitro amp makes a big difference. I heard one back to back in a friend's Unlimited and the difference is very noticeable. Soundbar is louder, midranges are more pronounced, and the bass hit harder.
I have one I was going to put in the for sale section, if you're interested PM me. I bought it to be a "trailblazer" and install it in my base model X but I quickly realized that it would be far less work and I wouldn't have to hack my wiring harness all to heck by using an aftermarket amp.