Sale Low Stock or Special Order. Please contact us to confirm availability and to place order. MBRP MBRP AT-8513P MBRP 11-13 Polaris RZR XP 900 Slip-On Combination Exhaust w/Performance Muffler MSRP: Was: $347.36 Now: $329.99 Low Stock or Special Order. Please contact us to confirm availability and to place order.