SPEEDWERX Stage 2 Exterminator Kit // 2025 Arctic Cat CATALYST M 858 C-TEC2 Models

Speedwerx Stage 2 Exterminator Kit // 2025 Arctic Cat CATALYST M 858 C-TEC2 Models

Our Exterminator Kits are designed and tested as a package to ensure our customers are running the correct combination of parts for their particular model, giving you the confidence that you are getting the best bang for your buck. These kits are designed for everyday type riding and require premium pump gas. 

Dyno testing on the 858 has shown a 18hp gain with our Pipe, Y-Pipe, Stealth Head, and Air Intake, with another 3hp gain estimated with increased compression ratios at high elevation! We will be offering our Exterminator Kits for a complete package that include these parts plus an ECU Tune and Hypershift Clutch Kit for maximum power and performance in a bolt-on kit. Update 2/28: an ECU Tune is required with the Pipe/Head/Intake combo! Note: If you wish to use pump gas at varying elevations, order the Stealth Head for the lowest elevation you regularily ride at. Higher compression heads can be used at lower elevations with high octane race fuel or a race/pump blend, however we do not have specific fuel recommendations for these cases.

Stage 2 Exterminator Kit Includes:

• Speedwerx Fat Daddy Pipe & Y-Pipe
• Speedwerx Stealth Head Mod
• Speedwerx ECU Reflash
• Speedwerx Hypershift Clutch Kit
• Speedwerx High Flow Intake

Optional:

• Speedwerx Standard Lightweight or L2 Series Muffler
• EZ LYNK Device + Cables
  

We highly recommend our Exterminator Kits to get a complete bolt-on performance package developed on our dyno and thoroughly field tested to meet our strict performance standards. The Stage 2 Exterminator Kits are the ultimate choice for those wanting maximum power and performance in a naturally aspirated, stock displacement bolt-on package with pull and go reliability on pump gas. The Stage 2 consists of our Fat Daddy Pipe & Y-Pipe, Stealth Head Kit, ECU Flash, Hypershift Clutch Kit, and High Flow Intake.

The Fat Daddy Pipe & Y-Pipe is the key to making big power, but that's just one part of the performance equation. Our ECU Flashes that are developed in-house change the fuel and timing parameters to ensure you’re getting maximum power and excellent throttle response with pull and go reliability on pump gas. Our Hypershift Clutch Kits keep the revs in the sweet spot to get all that added power to the ground when pipe temps and RPM’s climb on a long pull across the lake or up the mountain. The Stealth Head Mod has our interchangable billet domes with a special chamber and cooling design to reduce the chances of triggering the knock sensor to keep you at peak power all the time, and it also enables those riding at higher elevations to safely bump up the compression on premium pump fuel as well. The High Flow Intake opens up the restrictive stock intake plenum to round out the package. You can use all of this in conjunction with your stock muffler for quiet power, or add our standard Lightweight Muffler that's lighter than stock for a liitle better sound at a level reasonably low for everyday trail riding, or the L2 Series Light n' Loud Muffler for the lightest weight with an aggressive race sound. 

You must send your ECU for programming, and Cylinder Head for exchange! Please include a copy of your invoice or a note with your return address and order number. We will hold your order to ship after we complete the Pipe Modification. 

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
iPad
iPhone
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