DK Custom Products

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Transformer™ External Breather System EBS For Harley M8 Milwaukee-Eight

Availability: In stock
Item #: DK-TFORM-BR-M8
Manufacturer: DK Custom Products

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Transformer™ External Breather System EBS For Harley Milwaukee Eight 4 Stage Catch Can EBS M8



External Breather System



Milwaukee-Eight Models


DK Custom Products

Made in The USA!



  • Fits All Outlaw HiFlow Air Cleaners
  • The Ultimate in Discrete Placement 
  • Includes 6 feet of hose
  • All Needed Hardware
  • Turn-Key System
  • E-Z Install ~ Step-by-Step Instructions Included
  • Optional Filter or Catch Can (or use it without the filter or catch can)
  • Can "Transform" to be Emissions Compliant
  • Patent Pending


The Transformer External Breather System is the ULTIMATE EBS to use with the Outlaw HiFlow Air Cleaner Systems.  

The Transformer™ works with ALL OUTLAW Air Cleaners (425, 587, 606, 636v 828 & Velocity Stack)

 OEM, Screamin' Eagle or Arlen Ness air cleaners are NOT Compatible with the Transformer™ EBS


The REVOLUTIONARY Design of the Transformer™ EBS:

1.  Doubles as a Support Bracket

2.  Can be used as an External Breather System

3.  Can "Transform" into an EPA (emission) Compliant System

4.  It is the Ultimate in Hidden, Discrete, External Breather Systems

5.  Can be ordered with just a hose, a Filter or a Catch-Can



The EPA has required Harley to route hot, dirty, oily crankcase air back into the air cleaner compromising the performance of your engine. This vents it without compromising the performance and longevity of your motor. 

Or, if you are in an area of the world that requires internal venting, this will "Transform" to be routed internally while still being able to run A Performance Outlaw Air Cleaner.

The Transformer™ also acts as a Support Bracket, so the factory support bracket, or an aftermarket support bracket, is not needed when running an Outlaw HiFlow Air Cleaner. 

With this breather system you will experience a slight performance increase.  This is because engines like Cold, Dry, Oxygen Rich air!

The Transformer™ is shipped in External Breather System configuration, it can also be easily “Transformed” into an emission compliant system.  

When ordering, you have the option of no filter or catch-can, a Filter, or a  Machine Cut Aluminum Finish or a Black Powder Coat Finish Catch Can.

The Machine Cut Billet Aluminum Finish can be polished to a Mirror Finish.

The top of the Catch Can is attached to the hose by a zip tie or hose clamp (both supplied w/ the kit).  The bottom of the Catch Can threads to the top. 

Anytime you want, you can un-screw the can portion, empty out all the gunk, and then thread it back together.

The top of the Catch Can is vented, letting the air escape, while the 4 Stage Filtration catches and holds the oil.

The Catch Can is 1 1/2" in diameter and 2 5/8" tall.  For more details on 4 Stage Catch Can, Click HERE.


E-Z Install

Fits All Milwaukee-Eight Models - 2018-UP Softails, 2017-UP Touring and Trikes equipped w/ a DK Outlaw Air Cleaner

*Fits ALL Outlaw Air Cleaners.  

Does NOT Fit OEM, Screamin' Eagle or Arlen Ness Air Cleaners

Does NOT Fit oversized Throttle bodies, like the 64mm that some use on the 131 kit.


Caution:  Motorcycles modified with this DK Custom Products High-Performance part may not be legal for public highway use in some areas.  The user shall determine suitability of this product for his or her use.


"I've run this for the last 2 years on my Twin Cam.  Not only is it an effective External Breather System, it is so discrete that no one ever saw the hose coming from the bottom of the Transformer.  This is the Ultimate EBS."  -Kevin 

What is Different about the Transformer™?

  • No banjo fittings

  • No visible hoses

  • Looks like a compliant set up

  • Can be "transformed" to be compliant

Increased Intake length facilitates a faster/smoother intake charge (=More Power)


The hot, oily, air is coming out of the heads, through the bolts, and traveling into these small holes into the inside of the External Breather System...

...Moving down & eventually out of this exit hole at the bottom, where a discrete barb & hose are installed for routing to your catch can or filter.


What's Up on The Inside? How Does it "Transform" to Be EPA Compliant?

 To "Transform" this EBS, use the provided allen wrench to remove the 6 screws holding the backplate of the EBS in place...



 Want to Be EPA Compliant? (who knows what the future holds) Here's how the transformation happens....


By simply removing these small rubber seals from each side of the Transformer, the blow-by... now traveling into the into your intake, making your Harley EPA compliant.


 Transform it back to feeding your Harley Cool, Clean Air by replacing the rubber seals previously removed!

Customer Reviews

Transformer EBS w / Filter Review by Noodles
This Transformer EBS is a first class addition to my 17FW. The billet aluminum body is machined to perfection. All installation hardware is top of the line. The directions are clear and easy to follow. I chose the straight down pre threaded hose barb with chrome filter hanging beneath the AC cover. Outstanding! Spotless install that looks amazing! Thanks (Posted on 2/2/2024)
Great product, easy install w/ online videos Review by Konstantin
I got this for my RK 2022 and it seems to make the difference together with straight flow slip-on pipes: the engine has more air resulting in subjectively higher torque esp. around 2.8-3.0k RPMs.

There was a small issue with the EBS module, which has been very quickly resolved by DK's team, which I appreciate very much!

A couple of suggestions that might help to improve in the future:
- the threading for outflow fitting on the EBS unit is very tight and I didn't dare to screw it all way in to avoid damaging the aluminum module. Perhaps, a bit of CNC tuning is needed.
- I suggest to put a QR-code of video instruction URLs on the printed sheet: they are very useful in combination with the information in the manual.

Thank you! (Posted on 9/29/2023)
Great invention Review by Jim
This is a great product for your bike. Clean look, easy to install. Could use a few more pictures in the instructions. But overall worth the money. (Posted on 8/14/2023)
Great design Review by Exymount
Very well done, easy install and no more crap into my engine ! (Posted on 5/21/2023)
Transformer™ External Breather System EBS For Harley M8 Milwaukee-Eight Review by Bob
What a great product! Super easy to install and is doing a great job of routing all that crap to the catch can. Worth the money. (Posted on 5/9/2023)
Transform Review by Allen
Great product awesome fit and finish easy to install very happy with purchase (Posted on 4/11/2023)
Great kit Review by RIP
I had the original EBS with a 606 air cleaner on my 2017 Road King. I love the 606 air cleaner. I could never get the banjo fittings to not leak a little oil, and routing the hoses and locating the catch can never looked that great. The Transformer is a game changer. It’s a very complete kit. I was able to locate the catch can directly below the 606, and it looks great. (Posted on 10/22/2022)
Very complete kit Review by Mshots
Great engineering. A very versatile kit that includes all of the parts to install the various options. Worth the money. (Posted on 6/20/2022)
Very complete kit Review by Mshots
Great engineering. A very versatile kit that includes all of the parts to install the various options. Worth the money. (Posted on 6/20/2022)
Very complete kit Review by Mshots
Great engineering. A very versatile kit that includes all of the parts to install the various options. Worth the money. (Posted on 6/20/2022)
Sleek look minimal look that works! Review by Just Drew
Installed on a 2020 FLHXS w/tab performance intake.

I had previously used DK's catch can setup, which worked, but left some visible hoses, plus the occasional emptying of the can.

Once I saw the videos and pictures of this product; this was an instant buy!

I've put on ~500ish miles now with the transformer installed, and I can say that I couldn't be happier with it!

Zero maintenance, and super clean looking. I can see the vapors (mostly steam) escaping after going for a ride. No leaking etc.

Great product! I'm looking forward to future innovations from these guys.

(Posted on 6/3/2022)
EBS for M8 Review by Chuckster
Wanted something a little better than a couple of banjo fittings and a hose and this worked great customer service is very responsive very satisfied bought the catch can and filter both seem to work well
Thanks guys (Posted on 5/24/2022)
Easy install Review by Paul K
The transformer was easy to install, Followed the instructions all went well, ran hose to conceal the catch can down by floorboard out of the way. Also easy to get to when time to clean. The machining is second to none, looks great well done DK. (Posted on 5/22/2022)
Quality materials and easy install Review by Evel
I had been thinking of doing an external breather for a while...never knew I needed one until I saw your Youtube channel...then I saw this product and it was a no-brainer. Easy install, plenty of tubing to route where you want. (Posted on 5/20/2022)
Another excellent product! Review by Kevin Z in Arabi
Not that I'm worried about the EPA or state cracking down on where I live, but this is an excellent product! I thought the instructions were confusing but putting it on was no problem whatsoever. I already had an EBS with premium catch can, so this just took about an hour and some thought. No more hose running down the side! Catch can fit quite nicely just under the transformer with a tiny piece of hose. THANKS DK!!!! (Posted on 5/15/2022)
Great Product and Superior Customer Service! Review by FRF
1st of all the Customer Service is 2nd to none. Natalie, Dwayne and the other girl who answers the phone (sorry I forgot your name) are all knowledgeable, personable and down to earth.

On to the transformer easy to follow instructions , good quality and easy to install. All the other products I purchase are the same quality and easy to follow instructions. (Posted on 5/11/2022)

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