Speedwerx - Arctic Cat Stage 2 Exterminator Kit // 2020-2021 M 8000 / Riot X 8000 ACM8000EXT-20-2

Speedwerx - Arctic Cat Stage 2 Exterminator Kit // 2020-2021 M 8000 / Riot X 8000 ACM8000EXT-20-2

Regular price
$2,348.59 USD
Sale price
$2,348.59 USD
Regular price
Sold out
Unit price
Shipping calculated at checkout.

Speedwerx Stage 2 Exterminator Kit:


Our Stage 2 Exterminator Kits are the ultimate bolt-on performance package for the 800 C-TEC2! +12-13hp peak and +16-17hp midrange on 2020-2021 models! 

Our Exterminator Kits are designed to ensure our customers are running the correct combination of parts for their particular model. These kits are designed for everyday type riding and require premium pump gas. We have grouped different options of our performance parts together to ensure our customers are looking at the correct combination of parts, giving you the confidence that you are getting the best bang for your buck. +12-13hp peak and +16-17hp midrange on 2020-2021 models!

Stage 2 Exterminator Kit Includes:

  • Speedwerx Fat Daddy Single Pipe and Y-Pipe (4.5lbs lighter, add a muffler and lose up to 18lbs.)
  • Speedwerx ECU Reflash
  • Speedwerx Stealth Head Mod
  • Speedwerx Hypershift Clutch Kit 
  • Frogzskin High Flow Intake Vents
  • Speedwerx Black Anodized Aluminum Panel Vent Kit
  • Speedwerx Exhaust Valve Cable Gauge
  • DOES NOT INCLUDE A LIGHTWEIGHT MUFFLER, those are available separately, be sure to add one to your order if you wish to receive one!
  • They can be found HERE

** Kits offered through Mountain Side Performance will come with the ceramic coated y-pipe (upgrade over black painted finish). They will also ALL include the ECU reflash in the pricing **

** The ONLY kits we offer, without special order, are for 8-10k ft in elevation **

** You must send your ECU to us or Speedwerx for programming, we are not offering the PCV option at this time! **

Please include a copy of your invoice or a note with your return address and order number. 


Ship via USPS to:

Mountain Side Performance

PO Box 1352 

Kremmling, CO 80459-1352

Contact us at mountainsideperformancellc@gmail.com for UPS or Fedex options



Arctic Cat 8000 Pipes Tested At DynoTech Research!

Recently, DynoTech Research in Batavia, NY conducted an exhaust pipe comparison on a 2020 ZR 8000. A completely stock machine with 2000 miles was hooked to the SuperFlow engine dyno to run the stock exhaust against five aftermarket pipe options including the Speedwerx Pipe and Y-Pipe Kit. When all was said and done, the Speedwerx pipe topped them all with 9.8hp better than stock and 2.8 to 6.9hp better than the competitor’s exhausts! 

Here’s a summary of the peak power and torque numbers but for all the details on the dyno session, check out the subscriber pages at dynotechresearch.com.

Stock - 153.6 hp @ 7900 - 102.6 ft-lbs. @ 7800

Pipe 1 - 156.5 hp @ 7800 - 105.8 ft-lbs @ 7750

Pipe 2 - 159.6 hp @ 7800 – 108.1 ft-lbs @ 7600

Pipe 3 - 160.4 hp @ 7900 - 107.2 ft-lbs. @ 7800

Pipe 4 - 160.6 hp @ 7950 - 106.8 ft-lbs @ 7850

Speedwerx - 163.4 hp @ 7950 - 108.6 ft-lbs. @ 7850

This also backs up a previous test at DynoTech that showed a 9.9hp gain on a 2018 model.

The pipe is just one part of the performance equation though. 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 Single Pipe and Y-Pipe, ECU Flash, Stealth Head Mod, VForce Reeds (2018-2019 only), Hypershift Clutch Kit, High Flow Intake Vents, Aluminum Panel Vents, and Exhaust Valve Cable Gauge. The Stage 2 delivers 12-13hp more at the peak, and 16-17hp more in the midrange, and you'll also save 13.9 to 18lbs when combined with one of our lightweight mufflers! 

Not only was our Fat Daddy Pipe and Y-Pipe the clear winner among the those tested by DynoTech, it's 4.5lbs lighter than stock too. We also have a high elevation specific pipe for better performance at altitude, or an optional adjustable pipe with interchangeable stingers if you regularly switch between high and low elevation. Now available for all 2018-2021 models, 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. 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. We tested numerous reed designs in 2017, and settled on a special design from VForce that proved to be better than all others on the 2018-2019 engine, while the 2020-2021 kits work well with the stock reeds due to the different OEM cylinder and injection design. 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 Intake Vents deliver more cool air to make more power, and the Panel Vents help keep your belt and clutch temps in check. The Exhaust Valve Gauge is an easy way to check cable lengths to ensure they are in spec to eliminate any potential running issues, something that's often overlooked on these machines. Add our standard Lightweight Muffler that's 9.4lbs lighter or the L2 Series that sheds 13.5lbs, and you'll save 13.9 to 18 pounds overall!

We also offer a Stage 1 Exterminator Kit for a little easier installation at a lower price point. It does not include the Stealth Head or VForce Reeds so the power gains aren't as strong in the midrange, but it's noticeably better than stock with the same 12-13hp peak power gain. If you find yourself wanting more, you can always upgrade to the Stage 2 spec down the road as well.