Features May Include: 999CC ProStar® EFI ENGINE Designed specifically for extreme performance, the Polaris ProStar® 1000 engine features 999ccs of big bore twin displacement and all of the hallmark ProStar® features. This includes dual overhead cams, electronic fuel injection, and 4 valves per cylinder. It also features 48MM throttle bodies and long-tip fuel injectors giving the 2015 RZR XP 4 1000 instant throttle response, quick to rev characteristics, and the highest horsepower in the sport SxS market. 110 HP ProStar® 1000 H.O. For 2015 we wanted even more power and torque! So we tweaked the cams, installed bigger valve springs and optimized the fuel map to give you 110 horses of High Output power. Dual overhead cams (DOHC) actuate four-oversized valves per cylinder, slamming a huge fuel charge into the combustion chambers of the engine for maximum performance and minimal weight. HIGH-FLOW CLUTCH INTAKE SYSTEM We've completely re-designed the clutch cover, secondary helix and ducting system to offer the most durable clutch system ever on the RZR XP 1000. New ducting provides twice as much airflow and decreases belt temperature by up to 50 degrees. Suspension Features NEAR BOTTOMLESS FEEL WITH EXCLUSIVE WALKER EVANS SHOCKS Industry-exclusive Walker Evans needle shocks deliver next level performance and tuning capabilities. Aside from the ingenious anti-bottom needle technology, the 2.5-inch diameter rear shocks feature tool-less 16-position compression dampening control, allowing you to tune for the perfect ride for any condition. LONG TRAVEL DUAL A-ARM INDEPENDENT FRONT SUSPENSION The dual A-arm front suspension on the RZR XP 4 1000 delivers a plush 16-inches of travel and features a dual coil-over spring design. By using two individual springs and a crossover point versus a single dual rate spring, the RZR XP 1000 delivers a smooth, precise ride no matter the terrain. Agility Features INDUSTRY LEADING GROUND CLEARANCE AND TIGHT TURNING RADIUS The RZR XP 4 1000 features an industry leading 13.5-inches of ground clearance giving you plenty of room to transition over obstacles in harsh terrain, and turning radius is critical when it comes to agility so we feature a quick 2 turn lock to lock steering ratio to maintain a tight turning radius. HIGH PERFORMANCE ON DEMAND ALL-WHEEL DRIVE SYSTEM The On-Demand True All-Wheel Drive System is revamped with an 80 percent improvement in strength over the standard system. The result is the most durable front drive system ever found on a RZR. The system features a brand-new, close ratio final drive to keep the front wheels pulling stronger and longer maximizing power delivery to the ground on even the loosest terrain. The reduction provides increased traction without sacrificing steering effort to provide unmatched point-and-shoot handling. PERFORMANCE OPTIMIZED SUSPENSION GEOMETRY A race-inspired 3-link rear suspension maximizes acceleration, sharpens control, and improves straight-line tracking by keeping the tires in contact with the ground more often. Polaris redesigned the already best-in-class 3-link suspension introduced in 2011 with revised geometry to offer 25% more ground clearance from leading edge of tire in regards to the trailering arm; optimized camber gain for improved traction; and a longer trailing arm for added strength. STANDARD ELECTRONIC POWER STEERING Revised front suspension geometry and standard Electronic Power Steering (EPS) results in less steering effort and delivers the ultimate in control with reduced rider fatigue.