DK Custom Products

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Transformer™ External Breather System EBS For Harley Sportster

Availability: In stock
Manufacturer: DK Custom Products

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Harley Davidson Transformer External Breather System Sportster & Big Twin Evo DK Custom Outlaw air cleaner EBS Roadster  high flow M-8 milwaukee-eight softail twin cam dyna 72 48 Big twin evo nighster iron catch Can



External Breather System


Sportster Models 1991- UP

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 HiFlow Air Cleaners. (425, 587, 606, 636v, 828 or Velocity Stack)

OEM, Screamin' Eagle & 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 Most Sportsters 1991 & Up (except XR1200)


*Fits ALL Outlaw Air Cleaners  

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


"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

Awsome Review by Wit
I have tried to find the best solution to keeping oil out of my engine ever since I went stage one. This system is the best out there, high quality! And it works , was able to test with the warm weather we had, went out for a ride and checked the air filter, dry, would highly recommend this product!!! (Posted on 2/17/2023)
I love it Review by Buck A.
It was a perfect fit & very easy to install. It works great with my DK Hiflow 828 Air Intake system. I used the straight drop down connector which goes directly into the catch can. It looks like it came that way from the factory. My hat goes off to DK Custom Products once again. (Posted on 5/11/2022)

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