Aftermarket Assassins '22-'25 Polaris RZR Pro R 275 HP 4 Cylinder Stage 4 Lock & Load Kit

Aftermarket Assassins '22-'25 Polaris RZR Pro R 275 HP 4 Cylinder Stage 4 Lock & Load Kit

Lock and load your Polaris Pro R 4 cylinder and get ready for some serious kick!

The Pro R is an awesome machine, but Polaris left a ton of room for improvement on the table. This simple kit is the best way to wake up your Pro R as it comes with our proven ECU flash. The ECU flash adds some amazing horsepower from low end to high end RPM and really gives your machine that "snap" you're looking for. Our AA Stage 3 clutch kit compliments the tuning perfectly by more efficiently transferring power to the wheels and ridding yourself of the very lazy factory clutching setup and poor belt grip. We finish out the kit with our AA RZR Pro-R full exhaust (head pipe and muffler) and it's just what your machine needs! We set out to produce an exhaust that looks great, sounds great and has adjustable sound levels while producing the most power possible.

BC "Drop-In" camshafts work extremely well, but especially well above 8400 RPM. This comes into play for all types of riding, but especially those riding faster pace and/or dunes riding. Running at 8500-8700 RPM works well in these situations. Cams are "drop-in", but valve clearance still should be checked and adjusted with new buckets as needed.

Center exit exhaust with a chambered muffler: This design uses your OEM tip/spark arrestor making it a very quiet exhaust with the 3" side dump closed with optional 3" Stealth Quiet Cap. Open up that 3" side dump and let it scream when you want to! This center exit design with 3" cutout allows for wild and mild sounds in seconds by bolting/unbolting the 3" Stealth Quiet Cap, or the flip of a switch if you choose to upgrade to the electronic cutout.

Looking for the best/most badass ECU tuning available for your RZR Pro R?: AA's performance tunes are now available to gain horsepower and torque. Through our advanced ECU tuning we are able to modify parameters correctly to gain you the power needed. We are highly experienced in tuning RZRs and this will show. The Pro R uses a new Bosch MG1 ECU. Currently no programmers are available that flash without first having the ECU unlocked. The HP Tuners Remote Tuning Device (RTD) allows the ECU to be flashed remotely at any time using the AA/HP Tuners RTD and your smartphone once the unlock process has been completed from AA. See HP Tuners RTD information below:

• HP Tuners Remote Tuning Device (RTD) option - Upgrades to HP Tuners RTD which includes the RTD, OBDII to Polaris Diagnostic Port cable, necessary credits to flash your ECU, one AA custom tune (more tunes optional), and ECU Unlock performed at the AA facility. Requires ECU to be sent in to be unlocked unless purchasing ECU outright . After the initial unlock, the ECU can now be flashed remotely at any time using the HP Tuners RTD and your smartphone. See links at bottom of product page for flashing your vehicle and data logging.

We offer two clutch kits: 

• Standard Load: The Standard Load clutch kit is meant for stock or near stock size tires and is the one for most fast pace riders or racers. If crawling with a 2 seat model on 34-35" tires we recommend the High Load setup. You'll sacrifice some acceleration but have much better low end belt grip for less belt slip.
  • 2 Seat Models: 32-35" dirt tires or 30-32" paddles
  • 4 Seat Models: 32-33" dirt tires or 28-30" paddles
• High Load: The High Load clutch kit is meant for those with larger tires or riding style is mostly low speed crawling
  • 2 Seat Models: 36"+ dirt tires or 33"+ paddles
  • 4 Seat Models: 34"+ dirt tires or 32"+ paddless

Included Level 3 Tune: This tune is developed for a Pro R with our aftermarket exhaust and Brian Crower High Performance Stage 2 Cams on 91-93 octane. This tune adds +29 RWHP peak and a massive +33 RWHP at 45 MPH (This is gaining roughly +50 crank horsepower) putting you at roughly 275 crank horsepower! Our included Stage 3 clutch kit with this tune really helps the belt to grip and to help drive the extra power to the wheels. **Note : For Level 3/cams We HIGHLY recommend upgrading to the HP Tuners RTD. While our tunes have been proven to work great with our shop vehicle and many others, some may have idle issues that need a revised tune. Higher lift camshafts are very finicky at idle. If you were to have idle issues, with the HP Tuners RTD we can deploy revised tunes quickly and easily whereas with a simple ECU flash that is not an option - you would need to send your ECU back for a reflash.

Looking for race fuel tunes?: We were also, but unfortunately we found no real power increase by adding octane. Certainly a little extra octane is never a bad thing to keep your ECU from pulling timing based on engine knock, but we tried various attempts to make more power with no significant results.

Why AA tunes over others?: We have been tuning UTV's with CVT clutches for a long time, longer than almost anyone in our field going back to the 800 RZR. Tuning a CVT vehicle properly is not an easy task as you have so many variables at one time. We spend the time to wheel dyno(with actual UTV tires) correctly per modification, and have advanced ECU calibration and clutching knowledge to do so. Every change in horsepower can result in us changing clutching several times. We also develop most of our supporting mods so we know everything works correctly, and build parts to fit the vehicles needs. Lastly and honestly the most important; we then back up our results with real world data logging on local trails and our facility on 110 acres. It's this combination that truly makes the difference and why AA normally has a faster vehicle with the same or less rated tune horsepower. We left nothing on the table on the Pro R bolt-on parts, if others claim more power/gains for the same mods use caution in believing it!

Features:

• Big horsepower gains
• Much quicker throttle response and power delivery giving a whole new feel to the vehicle
• Throttle by wire limiters disabled
• Fan on/off at 180 degrees Fahrenheit (Stock is 191) which is just above the thermostat opening temp. The progressive fan also ramps up quicker to keep you running cooler than OEM.
• Speed limiter removed in low and high gears - Most will be able to run over 100 MPH if you have enough room/right conditions!
• Start in any gear with brake (RTD flash only)
• More throttle % in low gear and reverse as the factory limits these gears to not open the throttle fully
• Rev limit at a safe 9200 RPM (stock is 8650). Ideal peak wide open throttle RPM is 8200-8500 with the flash, but 9200 is for ramp up overshoot/top speed.
• AA's wicked timing curve is safe for the fuel octane recommended, but we do a much better job of finding timing limits for ramp up/more torque. Many others simply focus on wide open throttle timing/fueling.
• AA's tunes are developed for 91 octane unless specified otherwise.
• AA's modified fuel curve will still get decent mileage cruising, but is corrected over the factory lean AFR when needed.

Kit Includes:

• AA stage 3 ECU flash for 2022-25 RZR Pro R 4 Cylinder Models
• AA Stage 3 Clutch Kit with Primary Clutch Limiter & Butter Shift Washers
• AA Stainless Full Exhaust (head pipe & muffler)
• Brian Crower High Performance Stage 2 Cams.

Stage 3 Clutch Kit includes: 

• AA Recoil Magnetic Adjustable Clutch Weights
• Setup / Installation Sheet
• Primary Spring
• Primary Clutch Limiter
• AA secondary Helix
• Secondary Spring
• Butter Shift Washer / Shim for increased spring preload & less spring harmonics.