Milwaukee-Eight Stage 1 Performance Upgrade Bundle | Black Package


We've finally put together a Milwaukee-Eight Stage I Performance Upgrade Bundle for your M8 Harley-Davidson! 

Our Stage 1 Performance Black Package for your M8 Harley-Davidson Includes:

  • D&D 2-into-1 Billet Cat Exhaust - Black
  • Ghost Pipe (optional) - Black
  • D&D Exhaust Tips - Black (30º or Straight)
  • Arlen Ness Big Sucker Air Cleaner - Black backing plate
  • ThunderMax AutoTune for M8  

There’s a lot of talk among touring bike owners about starting your upgrade at Stage 1 … if it’s worth the expense, if it really improves performance, and if your bike really needs to be modded so soon. Well, the answer depends on whether you really want a better running ride than you brought home. And yes, starting at Stage 1 upgrades is a must. Stage I is the performance foundation necessary before even thinking about Stage II upgrades and beyond. 

Here's more detail about our best black package picks mentioned above for your M8 Stage 1 performance upgrades: 


D&D has designed an impressive new exhaust system for your 2017-2019 Harley Milwaukee-Eight motorcycle.  It’s specifically engineered to pump up the bike’s horsepower and low-end torque. This good-looking pipe system delivers a deep, throaty sound to your motorcycle, even at idle. Check out some of the additional features:

  • The M8 Billet Cat full system is equipped with exhaust gaskets, heat shields, a baffle, brackets and a bolt kit. It includes 18mm oxygen sensor bungs and a 12mm insert for the 12mm sensors.
  • The system features a 2 1/2” core Vortex-wrapped baffle that delivers an impressive increase in performance on 107-inch to 124-inch motors.
  • The 4” muffler body is connected to a double-stepped header that graduates from 1 3/4" at the head, up to 1 7/8" to 2 1/8" at the collector. The final measurement graduates to 2 1/2" at the point where the header connects to the 4” muffler housing.
  • D&D now gives riders the option of choosing their end cap type. 
  • You can also choose an optional Ghost Pipe to balance out the look of your exhaust.

D&D 2-into-1 Billet Cat Exhaust - Black


The BIG SUCKER™ air cleaner Stage 1 kit is designed to fit all 2017 – 2019 Milwaukee Eight touring motorcycles. New technological developments resulted in new, patent-pending system design for a hidden breather backing plate. Each breather now includes O-rings at the heads and proprietary breather tubes that significantly increase airflow – and more air equals more power. The new system also takes care of a few common problems:

Arlen Ness Milwaukee-Eight Big Sucker Air Cleaner

  • It recycles excess breather oil back into the bike’s engine, eliminating common oil issues eliminates oil-based issues commonly linked to M8 engines. This action prevents oil from saturating the oil filter and limiting airflow.
  • A newly redesigned oil catch-can is built in to the backing plate.
  • The filter top plate is constructed of aluminum and includes integrated mounting studs and directional air cleaner for better performance and an increased lifespan.
  • The washable and re-usable performance filter is made of red, pre-oiled, surgical-grade cotton.
  • This filter is enormous! It has more than 200% more surface area stock filters. The tapered shape provides an increased surface area that outmatches any other comparable performance intake option on the market.
  • The backing plates are available in two styles: chrome or black finish
  • Each M8 Big Sucker Stage I kit includes a one-piece backing plate, one performance filter and top, breather tubes, one oil catch-can (built in to backing plate), hardware and gaskets.


The ThunderMax® system puts total control over your EFI back into your hands. It’s a stand-alone tuning system designed with proprietary Wave Tune AutoTune technology. It perfectly interfaces with your new wide-band O2 sensors that come with this ThunderMax tuner. While you’re riding, it automatically analyzes and adapts to an extensive range of throttle and RPM changes and positions. These automatic adjustments seriously increase your Harley’s performance. This award-winning system is manufactured in the United States and ready to install – no wire splicing or cutting required.

Milwaukee-Eight ThunderMax

In addition to the ThunderMax® ECM, two wide-band oxygen sensors and a tuning cable are included in the kit. The tuning suite software allows you to monitor and/or adjust the following, including diagnostic codes, warm-up settings, ignition timing and more:

  • Engine temperature and alarm
  • Accelerator pump simulation
  • Fuel injection pulse
  • Idling speed and revolutions limit
  • Deceleration pop control
  • Speedometer calibration
  • Real-time engine tuning
  • Running statistics and logs

Your new ThunderMax tuner will adapt seamlessly with any future upgrades (Stage II, III and beyond) to your motorcycle, never being outgrown, and also never needs to be dyno-tuned. Your ThunderMax module is backed by a 3-year manufacturer warranty and unlimited manufacturer tech support. 

Interested in ordering but have a question first? Simply complete the form below and we'll get your question answered fast! 


Shipping Delays

We are aware there are orders outstanding. Rest assured that your order has not been missed nor forgotten. A worldwide microchip shortage and other pandemic-related challenges have slowed the supply of products in many industries, including electronics. We're sorry for this problem and are working with our manufacturers to replenish stock and fill backorders. Our advisors and support reps have no extra info on when we expect this item.
Our supply chains have been affected, distribution centers are backlogged and international shipping agencies have been severely affected by COVID19. Unfortunately, these things are completely out of our control. Once your order ships you will receive a SHIPPING CONFIRMATION email stating your order is on the way with TRACKING INFORMATION. If you have not received this email, your order is still in fulfillment que and is working its way up the list.
Due to the fluid nature of the supply chain at this time, Fat Head Cycles CAN NOT provide ETAs on bundles that have yet to ship as many times we are simply waiting on one small part or another to complete the package. We here at Fat Head Cycles appreciate you as a customer and will always do the best we can to accommodate and fulfill your requests and your need for the best Harley Davidson audio and performance products in the industry.

Thank you for your understanding.

We appreciate you,

The Fat Head Cycles Team