do you have a link? - - I did a search on amazon and I am not finding a 5.25 kicker marine option
Actually it's a 6.5" speaker. The SSV hump pods are 6.5" as well as the "Rockford Fosgate" speakers that came in the SLR.
I also very much agree with what most have said.....placing the correct power to drive the speakers is key. Simply replacing the speakers may increase the sound quality, you are not going to gain much as far as volume.