RZR 4 900 Power upgrades? September 16, 2015 Ive had my new rzr for alittle over 2 weeks and ive added roof, windshield, lower doors, and front bumper, also have a new seal to do the fix for the front diff. Anybody doing performance mods with good results or just doing exterior stuff? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related