Aftermarket Assassins Stage 4 Lock & Load Kit | 2021 RZR Turbo & Turbo S 

Fits 2021 RZR XP Turbo & Turbo S Models New for October 2022 : our proven turbo now uses larger AR housings like the Pro XP turbo for even more flow and less back pressure. We went to the larger housings after testing and finding with the correct tune adjustments this turbo can spool just as fast as our standard water cooled turbo offered for years. The biggest difference from our previous turbo is the reduced exhaust backpressure (even further) which helps resist a knock event (timing retard/slight drop of power) on the same fuel. This is especially true for higher pressure tunes over 24-25psi and where you will see the most difference. If you build your motor with a billet crankshaft and use our wastegate with 15-17psi crack pressure, this turbo will build up to 29-30psi of boost on our race tunes. However, it will also trail ride on a level 2 tune and be wicked fun/reliable for those just looking for a good replacement turbo. New Pro Style housings with an XPT style center section with tucked water lines to make installation MUCH easier than installing an actual Pro XP turbocharger. Pro XP turbo's require cutting shields, a new drain tube, and all around slight fitment issues. This turbo still requires a bit of routing with the lines, but installs 10x easier than an actual Pro XP turbocharger. Are you looking to hurt some feelings? Then this is the kit for you! This Stage 4 kit is the most complete turbo upgrade kit you'll find for your RZR XP Turbo and backed with the best tuning out there to make your RZR rip all day long. This kit combines absolutely everything you need to take your RZR to above and beyond the competition. It includes our big water cooled turbo, custom tuning, S3 complete clutching, primary clutch limiter, our billet diverter/blow off valve, pre-gapped spark plugs, performance slip-on exhaust, high flow intake tube, and high flow charge tube. Our big water cooled turbo creates up to 255-260 crank horsepower! This complete turbo modification is just what you need for 25-27 PSI of boost! Boost temps will skyrocket quickly on the factory turbo, where as with our aftermarket turbo, they will be much lower... even at boost temps over 25 pounds! Now that we are moving air on the intake side, we need to get that air out. Our turbo includes a high larger diameter exducer and 10 blade exhaust turbine to create less back pressure and heat buildup in the motor. Heat buildup on the exhaust side is another HUGE issue with the factory turbo. What's essentially happening is you are running out of exhaust flow, and that makes more power very hard to produce. With this high flow turbine, we can increase boost and see a healthy increase in horsepower with our tuning on pump gas and race fuel. The factory wastegate is also a big problem as it's very weak, and as time goes on the spring only gets weaker. Building boost with a wimpy wastegate (like our competitors do) can produce varied results, hot temps, and turbo overheating. We install a high pressure actuator complete with a new bracket. This wastegate produces extremely consistent results, will hold a huge amount of boost, and is a key component in this turbo mod working so well. Each turbo is fully blueprinted and balanced from our turbocharger manufacturer. Our custom tuned Powervision ECU flash device will send the tunes directly to your ECU, allow you to change tunes within 3 minutes, and easily return to stock. It also has data logging capabilities, diagnostics, and is a great gauge allowing you to read boost, throttle position, RPM, and more. We then transfer the power to the ground MUCH better than the factory with our S3 complete clutch kit. Though we test mostly in the real world to get the best results, we did see a 7-10 RWHP increase from 20 MPH to 40 MPH on the wheel dyno with just the clutch kit. This kit also includes our high flow exhaust to get rid of the catalytic converter and restrictive stock muffler. This allows heat to escape much quicker, and allows us to tune more aggressively. Our exhaust features an EXCELLENT sound that is fully adjustable with our quiet core that blocks off one outlet. The diverter valve is an o-ringless tip design and is needed when increasing boost pressure to prevent factory valve failure. It also comes with a plug so you can have that classic blow off CHHHH sound when you want it. Our high flow intake and charge tube help to lower intake temps going into your motor which is HUGE when going with our Level 3 or higher tunes. For more detail on each product, see the individual product listings. Massive horsepower gains bundled into a simple package Quicker throttle response and power delivery For Level 4 and above we highly recommend the AA Pre-Airbox Intake Tube as the OEM tube is known to collapse at higher boost levels. For level 5 and 6 you MUST tighten your head bolts to 85ft-lbs (requires cam removal). This is also suggested for level 4. Stock like drivability! On our dyno we saw 204 RWHP @ 27 PSI on 110 octane with some serious top end pull. Other customers on car wheel dynos have reported 215-220 RWHP. That's a calculated 255-260+ crank horsepower! Gain another 10-15 RWHP on pump gas tunes over the factory turbo Big gains in low end performance and crazy high end gains on longer pulls (this mod does not fade off anywhere near as much as the factory setup) Lower EGT (Exhaust temps) due to higher exhaust flow and water cooling. This results in much cooler air intake temps as well. More efficient turbo all around which is easier on the turbo and motor even if you just want pump gas tuning (especially nice riding higher altitudes!) Uses factory mounting points, and easily plugs into oil cooler lines in minutes Includes head to turbo gasket, and you will re-use your gasket for the exhaust outlet as it's metal All level tunes feature: Throttle by wire limiters disabled, Fan on/off temp lowered to 185 degrees Fahrenheit, Seatbelt limiter disabled, Speed limiter removed in low and high gears, Rev limit at a safe 9200 RPM, more throttle in low gear, better throttle response, and much more! 1 tune is included in the price. We would recommend going with 2 or more tunes so you can switch to a lower octane tune if you run into poor quality fuel. The Level 2 turbo upgrade tune is a very safe 16-17 PSI 91 octane tune, good to run on any 91 oxy/ethanol. This tune produces 155-160 RWHP peak (calculated 195 crank HP), but will pull much harder and keep that horsepower maintained much better than the stock turbo. The Level 3 turbo upgrade tune offers 18-20 PSI and is also meant to run on 91-93 octane fuel. This produces 175 RWHP (calculated 220 crank HP) and comes on unbelievably strong, and keeps pulling. Those with 91 non ethanol, or 93 even with ethanol will be fine on straight gas. Those with oxygenated 91 might want to think about adding splash of race fuel or VP Octanium/boostane fuel additive. The Level 4 turbo upgrade tune is for 98-100 octane fuel. This will produce 185-187 RWHP (calculated 240 crank HP) at 22-23 PSI and hauls the mail! Most will mix race fuel with pump fuel to get the 100 octane which is what we recommend. A can of Octanium/boostane to your tank will also work with this tune. The Level 5 turbo upgrade tune is for 110 octane fuel and simply drops the hammer! You'll have everyone wondering what is done to your RZR with this bad ass tune. A huge 25-26 PSI of boost that comes on HARD. This tune produces 200-205+ RWHP (calculated 250-260 crank horsepower) on our dyno, and has shown 215-220 on customer dynos. We normally run this tune on 110 leaded fuel. Leaded fuel is harder on O2 sensors but we have not had much of an issue. We would suggest picking up an extra O2 sensor, or an O2 blockoff to keep around. The Level 6 E-85 turbo upgrade tune is simply unbelievable. Very similar to the 110 tune power, but runs on cheap corn (E85) fuel! This can also be ran on VP or other E85 fuels. This fuel makes the motor run cooler and it absolutely loves it. If using pump E-85, make sure you are between 70-85% ethanol for this tune. 25-26 PSI with a wicked timing curve that produces the same 200-205 RWHP. This tune requires our 1200cc injectors and our high flow fuel pump. The injectors are included in the price of the Level 6 tune. Selecting Level 6 will result in all tunes being built to run 1200cc injectors. You MUST run the 1200cc injectors with all tunes if selecting this option. Stage 4 Kit includes all supported mods needed to run Level 2 & 3: Power levels are shown with the AA exhaust with no quiet core installed. Supported mods needed to run level 4-6: Tighten head bolts to 85ft-lbs or install ARP studs to 85ft-lbs, catch can ( version 3 is highly suggested ), and pre-airbox intake tube Other recommended items: XPT Catch Can Version 3, Revolver Billet Clutch Cover, AA Stryker Worlds Best CVT Belt, AA Blow Off Valve Filter, AA Replacement Air Filter Helix features a tighter roller & EBS pocket for less clutch slop(clunk) and less chance of rollers breaking Performance Helix 107-1065 :  Aggressive helix with acceleration/higher horsepower/aggressive fast pace drivers in mind.  Designed for lighter vehicle weight, lighter tires, or higher horsepower vehicles. Works best with RZR Turbo or Turbo S 29-32" tires or 28-30" paddles with level 2 tune or higher.   High Load Helix 107-1062 :    Slightly less aggressive than the 1065 helix with good acceleration gains/power transfer over the OEM helix.  Designed for a normal to heavier vehicle, heavier tires, heavy sand load or crawling type riding in mind.  Works best with RZR Turbo or Turbo S with 29-35" tires or 28-32" dune paddles, OEM tune is fine, yet still works great with added HP.    Best all around helix for the 2021 RZR Turbo. For even more info on the products in this kit, see the individual product listings. If needing extra shims to align your clutch properly, we recommend our P90X Secondary Clutch Alignment Shim Kit . The only somewhat special tool needed is this: Secondary Clutch Compression Tool Highly recommend upgrading to our Heavy Duty P90X Secondary Clutch Rollers. If you have any other needs in these tunes, or any concerns; please e-mail!

 **3-5 Day Lead Time**