Hi Don, like you I have the Extreme 3" and I also added 3" spacers @ the bottom of the shocks for a total of 6". So far it has worked great and it cured my clearance problems where we ride.

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08' RZR, 29.5x10x12 Swamp Lites all around, 3" Extreme Lift, 3" lower lift, Rock Sliders, Brush Guards front & back, 4,000 lb Warn Wench, Dual Gun scabbards, extra lights up front and on top for those night rides & STK Motorsports Snorkels.