Polaris RZR Pro R 4 Cylinder Stage 2 (250 HP) Lock & Load Kit by Aftermarket Assassins

Description

Compatible with all 2022–2025 Polaris RZR Pro R 4-cylinder models, including Dynamix and EVAP versions.

Unlock the full potential of your Polaris RZR Pro R with the AA Stage 2 250 HP Lock & Load Kit by Aftermarket Assassins. Designed for enthusiasts who demand more power, quicker throttle response, and a more aggressive performance profile, this comprehensive upgrade package combines cutting-edge ECU tuning, precision clutch calibration, and a high-performance stainless slip-on exhaust system. Each component in this kit is engineered to work seamlessly together, transforming your Pro R into a trail-dominating powerhouse.

The included AA ECU Flash optimizes your engine’s parameters for maximum horsepower and torque. Expect a dramatic increase in responsiveness from low to high RPMs, improved throttle mapping, and removal of restrictive factory limiters. The flash also lowers fan activation temperature for cooler operation, eliminates speed restrictions in both low and high gears, and raises the rev limit safely to 9200 RPM. The result is a sharper, faster, and more efficient ride that feels completely reborn.

To complement the power upgrade, the AA Stage 2 Clutch Kit ensures that every bit of performance from the engine is effectively transferred to the wheels. Featuring magnetic adjustable clutch weights, improved springs, and a butter shift washer setup, this clutch system delivers smoother engagement, stronger belt grip, and quicker acceleration. The kit’s design eliminates the factory’s sluggish clutch response, giving you crisp, confident control in any terrain.

Completing the package is the AA Stainless Center Exit Slip-On Exhaust, built for strength, performance, and versatility. The chambered muffler design retains the OEM spark arrestor and allows you to switch between quiet and aggressive modes using the 3-inch Stealth Quiet Cap or optional electronic cutout. This exhaust not only enhances sound but also contributes to improved airflow and increased power across the RPM range.

With horsepower gains reaching up to 25 crank HP, this kit brings your Pro R’s output to around 250 HP with nothing more than a flash and exhaust upgrade. Developed for 91–93 octane fuel, the Level 2 tune delivers a perfect balance of reliability and performance. For owners running upgraded cams or seeking remote tuning flexibility, the HP Tuners RTD device allows fast ECU flashing and data logging through your smartphone once the ECU has been unlocked.

Aftermarket Assassins’ expertise in ECU calibration and clutch tuning ensures unmatched precision and reliability. Every tune is dyno-tested and real-world verified for proven results. Whether you’re racing through dunes, climbing rocky trails, or cruising open desert, the AA Stage 2 Lock & Load Kit provides the confidence and performance edge you’ve been looking for.

Kit Includes:

• AA ECU Flash for 2022–2025 RZR Pro R 4-cylinder models (requires ECU send-in or purchase option)
• AA Stage 2 Clutch Kit with adjustable clutch weights, springs, limiter, and washers
• AA Stainless Center Exit Slip-On Exhaust with 3-inch side dump and optional Stealth Quiet Cap

Key Benefits:

• Up to +25 crank horsepower increase
• Faster throttle response and stronger midrange pull
• Improved cooling and more efficient fuel curve
• Speed limiter removal and higher rev ceiling</