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Stage 1 Exterminator Kit // 2021-2022 Polaris 850 RMK

In stock

Now Available!

The Stage 1 Exterminator Kit combines our ECU Tune and Hypershift Clutch Kit to unlock maximum power and performance from your Polaris 850!

Now Available!

2023 model year tunes availability TBA.


Speedwerx Stage 1 Exterminator Kit for 2021-2022 Polaris 850 RMK (not for Boost models)

The Stage 1 Exterminator Kit combines our ECU Tune and Hypershift Clutch Kit to unlock maximum power and performance from your Polaris 850. Track Dyno testing has shown a consistent 5-6hp gain- 78-79hp stock to 84hp tuned and clutched. That translates to the performance equivalent of a 10-12hp gain at the crankshaft! Field testing on the snow has shown a 1-2 MPH gain in 1000 feet, and a 100-200 RPM gain with a heavier, harder pulling clutch setup.

About ECU Tuning:

Throughout our extensive R & D experience, we found that recalibrating the ECU/ECM is the best way to get the most out of your machine. We do this by taking the time to go through the entire ECU and optimize it from the ground up. Something that was not commonly done in current ECU tuners. This way we can tune it to as close to perfection for every scenario to outperform your current programming configuration. Your machine will be tuned and perform just as well as a machine that was on the dyno and tested for months on end so that it excels in every situation to be smoother, faster, more efficient, and more reliable.

Hypershift Clutch Kit Includes:

  • Speedwerx Machined Dual Adjusting Weights
  • Weight Adjustment Kit
  • H5 Alloy Primary and Secondary Springs
  • Speedwerx Lightweight Two Angle Helix (saves .4lbs)
  • Secondary Rollers to allow Two Angle Helix on 2021-2022 models


  • 2019-2020 Indy/Rush/Switchback 1"-1.352" Track 
  • 2019-2020 Indy/Rush/Switchback 1.5"-1.75" Track 
  • 2021-2022 Indy/Switchback 1"-1.352" Track 
  • 2021-2022 Indy/Switchback 1.5-1.75" Track 


  • Speedwerx Lightweight or L2 Series Ceramic Coated Muffler
  • Speedwerx Aluminum Panel Vent Kits For Axys and Matryx Chassis


You must send your ECU to us for programming! Please include a copy of your invoice or a note with your return address and order number. The return shipping cost for the service of your choice will be added when purchasing online. 

Ship to:

Speedwerx, Inc.
20195 Greystone Avenue
Forest Lake, MN 55025


Sending us your ECU is always the easiest and preferred way to get it done, but for those that wish to purchase a tool to flash their own ECU, we are using the new industry leading EZ LYNK Auto Agent 3 system. This will not only allow you to flash your ECU but you can also do much more.

  • Data Log live and record data to share with tuners or friends.
  • Run diagnostics checks on your machine as well as several other powersports and over the road vehicles. (brand-specific cables required for other powersports machines)
  • Reset power valves on Polaris 850 and 9r models.
  • Flash your own ECU with optional ECU Flash Power-Up Adapter


Get Connected with The World's Most Powerful Vehicle Scan Tool. EZ LYNK puts your technician in the front seat whenever and wherever you choose and is the vehicle interface for all EZ LYNK apps.

The EZ LYNK Auto Agent 3 Vehicle Diagnostic Scan Tool and Electronic Logging Device (ELD)

Who is it for?

Vehicle Owners - From 18 Wheelers to Powersports and everything in between. See what we offer for your Vehicle

Vehicle Technicians - Get Connected with your customer and their vehicles; Whenever and Wherever

Transport Companies - Owner Operator, Small and Large Fleet Sizes and even Bus Transport Companies

Commercial Motor Vehicle Drivers - Hotshot, Short Haul, Long Haul, Agricultural and Construction


60 Second Setup:

Plug the device into the Vehicle's OBDII Diagnostic Connector

Install the EZ LYNK Mobile App on your Android or iOS Device

Connect via WiFi

Diagnostic Scan Tool and More:


A Connected OBD Scan Tool for You and your Vehicle's Technician

Lynk with your Technician

View and Record Vehicle Data Parameters in Real Time

Share Recorded Data Logs with your Technician

Read and Clear Diagnostic Trouble Codes (DTC)

Perform Technician Recommended Vehicle Functions

Install Vehicle Firmware Updates provided by your Technician, Over-the-Air

Chat with your connected Technician, within the Auto Agent Mobile App


Auto Agent 3 w/ OBDII Connection

Devices and Software Compatibility:

Android 8.0 or Later

iOS 12.0 or Later



iPod touch


Additional Accessories to expand the Auto Agent 3 Connection and Convenience:

Class 8, Medium and Heavy Duty (Semi) vehicles - Auto Agent 3 HD Cables (6 and 9 Pin Round)

ATV, UTV, SnowMobile and WaterCraft applications - Auto Agent 3 Powersports Diagnostic Cables and ECU Flash Power-Up Adapters

EZ LYNK Phone Window or Dash Mount - The phone mount that sticks!

EZ LYNK ELD system requires a monthly subscription

More Information
ManufacturerSpeedwerx, Inc.
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WARNING: Cancer and Reproductive Harm-    See Proposition 65 Information for more on this Consumer Product Exposure Warning for residents of California.

These items are intended for closed-course competition only. Alteration of emissions-related components can constitute violation of federal and/or state laws. Substantial fines and penalties can result if used for other than closed-course competition use.