I have the whole Polaris stereo in mine, both kick panel and the overhead speaker mounts. You will definitely here it over the exhaust, and I have the FMF pipe on mine also. I just got a sirius add-on receiver stuck to my half-windshield and tied into the aux on the radio, works great!

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Gen 1 RZR, 14" Visions w/ MTR's,PIAA blue replacement bulbs and 5 PIAA lights, Front and Rear Pre-runner bumpers, Dual batteries, Jensen radio, with sirius radio, 4 kicker speakers, 2 kickpanel and 2 overhead, FMF pipe and trueflow filter, Walker Evans shocks, Half windshield,Sport roof, Bags under the dash and between the seats, Billet steering wheel and hub