Rockford Fosgate Stage 4 Audio System – Polaris RZR by BIlly with Side By Side Stuff | Dec 16, 2016 | Polaris, Rockford Fosgate, Videos | 0 comments We met with Rico from Rockford Fosgate at the 2016 SEMA Show; Rico was kind enough to go in depth on their easy to install plug and play audio system, the Rockford Fosgate Stage 4 Audio Kit designed specifically for the Polaris...