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AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S

AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S
AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S
AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S
AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S
AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S

AA Water Cooled Big Turbo w/Pro XP Housing | Polaris RZR XP Turbo / Turbo S

Sale price $1,995.00
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2016 - 2021 Polaris RZR XP Turbo
2016 - 2021 Polaris RZR XP Turbo 4

2018 - 2021 Polaris RZR Turbo S
2018 - 2021 Polaris RZR Turbo S 4

Instruction Manual

Aftermarket Assassins Water Cooled Big Turbo w/Pro XP Housing - OEM Upgrade Replacement for Polaris RZR XP Turbo / Turbo S


  • Turbo fits 2016-2021 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 XP 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 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.  
  • Ready to step up to the next level on your XPT and gain some serious power? Up to 255-260 crank horsepower! This complete bolt-on, water cooled turbo is just what you need for up to 25-27 PSI of boost!  The water cooled turbo is like what is used on the new Pro XP as the water cooling helps keep charge temps extremely cool.  This makes for more sustained power and cooler motor/engine/exhaust temps.   Boost temps will skyrocket quickly on the factory turbo, where as with our water cooled turbo and much larger compressor housing, they will be 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.  This turbocharger includes a high flow 10 blade exhaust turbine with a larger bore to decrease 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 can produce varied results, hot temps, and turbo overheating.  We install a high pressure actuator complete with a new bracket.  This wastegate has 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 balanced and set up from a professional turbocharger manufacturer. 
  • Thinking of another turbo upgrade?  Many of our competitors offer an inferior mod, and do not offer the advanced tuning we do. Many use stock wastegates, do not bore the compressor housing, or do not modify the exhaust turbine.  These are all huge reasons why our turbo works well. Tuning changes are drastic for modifications like this, and many others do not have the correct tuning knowledge to pair with such mod.  
  • ECU Type/o2 Color drop down choice:  2017-18 models ALL have the standard black lead.  In 2019+ models blue o2 leads are wideband models and we must know this.  These models are a different ECU type and will NOT do an ECU read (we supply your stock file).  For more information on this, see this link: https://aftermarketassassins.com/tech-blog/f/rzr-turbo-evap-ca-models# 
  • Requires AA custom tunes built specifically for this turbo. Wastegate crack pressure is 7 PSI
  • OEM turbo inducer is 36mm.  The AA turbo is 44mm.
  • OEM turbo compressor wheel is 50mm.  The AA turbo is a 60mm billet wheel.
  • OEM turbine (exhaust) wheel is 11 blade 39mm.  The AA turbo is a 10 blade 44mm
  • Much larger AR housings (snails of the turbo) vs. factory
  • Stainless steel turbine housing has greater corrosion resistance and is less likely to crack like the OEM housing
  • Stock like drivability!
  • Gain another 12-15 RWHP on pump gas tunes over the factory turbo
  • See THIS article on our turbo mod vs. water cooled turbo vs. the Pro XP 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's (Exhaust temps) due to higher exhaust flow
  • Lower intake temps before and after the intercooler
  • More efficient turbo all around which is easier on the turbo and motor
  • A must have if you ride in higher elevations where the stock turbo struggles to create boost
  • Our test results on our 2019 Turbo S Show 137-138rwhp.  A standard XPT has less aggressive clutching and will show 134-135rwhp stock.  
  • Testing results on the dyno have not been ran again since using the Pro XP housings, only field testing where we do all tune finalization.  From knowing how the Pro XP dynos compared to our WC turbo setup, it's safe to say we are modest on horsepower gains listed below, and actual results are most likely 5-10% higher, especially on Level 4 and higher.
    • 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 another 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. 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. 
  • IF you have a race built motor with a billet crank, or just want to see what your OEM motor will handle, we have race level 5 & 6 at 28-30psi we can custom build.  Please contact us if this is something you are after.  
  • Requires a high flow intake tube as the OEM will not fit over our larger inlet.  The AA aluminum intake tube or other silicone intake tubes meant for the stock turbo will work, but be tight.  The best option is to use the AA intake tube with our larger coupler (this is an option).
  • Supported mods needed for all levels:  AA big turbo tunes for PV, AA high flow intake tube, AA high flow charge tube, AA S3 clutch kit, AA blow off valve, AA slip-on exhaust or a slip-on exhaust that is free flowing. Power levels are shown with the AA exhaust with no quiet core installed.
  • Additional supporting mods needed to run level 4-6:  Tighten head bolts to 85ft-lbs or install ARP studs to 85ft-lbs (95 if using custom age 625+ studs), gap plugs to .020", catch can (version 3 is highly suggested), and pre airbox intake tube
  • 2016 models will need our 2017 style injectors and upgraded fuel pump.  If wanting to run E85 on a 2016 model, please contact us as you will then need 1200cc injectors... it's just a little bit more complicated.
  • Turbo kit includes:  Complete balanced AA water cooled turbocharger with stainless turbine housing, water lines, and instructions
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