Crutchfield Customer Review (What's this?)
Yes it made a difference in sound quality all together. The tech at a local store installed and said there was plenty of room behind the dash in 2013 Kia Optima. I recently installed the 6.5" Kenwood speakers in all the doors and the h.u didn't have enough power, however, you can also change that out if you didn't want factory h.u to aftermarket that can produce the same amount of power. 50w per channel.
Pros: Great for concealing a amp with limited space, clean installation.
Cons: If fuse blows you will have to take dash apart again to get to it.