2013 Polaris® RZR® XP 4 900 XTREME PERFORMANCE FOR 4 Dominate the terrain with your crew in this 2013 Polaris® RZR® 4-seater sport side. It delivers the ultimate combination of power, suspension and agility to dominate in the dunes, desert and wide open spaces. PROSTAR™ 900 ENGINE - Specifically built for extreme performance Side x Sides, the Polaris® ProStar™ 900 engine delivers 88 HP, the highest in the industry. It features Dual Overhead Cams (DOHC), 4 large valves per cylinder for high-RPM power and dual throttle bodies located close to the intake valves. Features May Include PROSTAR™ 900 ENGINE Specifically built for an extreme performance Side x Side. The Polaris® ProStar™ 900 engine features 88 HP, Dual OverHead Cams (DOHC), 4 large valves for high RPM power and 180 degree crank shaft for balanced performance. This delivers fast throttle response, groundbreaking power and revolutionary acceleration. This revolutionary acceleration is made possible by the 88 HP lightweight engine and total vehicle weight combined with big-time power to the ground. The result is loads of torque to all four wheels and unsurpassed off-road acceleration. NEW! LARGER REAR CARGO BOX New flat-bed design of rear cargo box has greater volume so you can carry more gear for yourself and your passengers. FASTEST ACCELERATING Without a doubt, it’s the fastest accelerating 4-seat Side x Side available, and fast acceleration equals big smiles and a fun ride for 4. This revolutionary acceleration is made possible by the powerful 88 HP engine and low total vehicle weight -- creating an incredible power-to-weight ratio -- plus massive power to the ground. LIGHT, COMPACT TRANSMISSION The transmission is specifically designed to optimize power from the Polaris® ProStar™900 engine. The innovative, lightweight design features a helical cut final drive with optimized gear geometry to maximize efficiency, even at high torque-loads. That means huge power that is efficiently delivered to the ground with minimal driveline noise. 3-LINK TRAILING ARM The 3-Link Trailing Arm IRS creates the smoothest, most precise ride in the industry. It’s a proven, durable design, with no excess parts to add weight. It features two rear control arms and a far forward-connecting trailing arm, resulting in a strong yet lightweight system. The industry-first standard 2.5” body Premium Walker Evans™ rear shocks provide the extra volume needed to dissipate heat and provide an incredible 14” of suspension travel to soak up the bumps and whoops. ULTIMATE CORNERING CONTROL To provide precise cornering, the suspension’s radius rods extend deep into the wheel hubs and feature an uneven link geometry that optimizes camber. This allows the tires to lean into the corner through the suspension travel, and plant more tire surface on the ground for maximum control.