DK Custom Products

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Transformer™ External Breather System EBS For Harley Twin Cam

Availability: In stock
Manufacturer: DK Custom Products

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Premium Catch Can EBS SysTransformer™ External Breather System EBS For Harley Twin Cam 4 Stage Catch Can EBS Twin Cam TCtem Harley Twin Cam DK Custom External Breather System Sportster & Big Twin Evo Roadster  High Flow M-8 Milwaukee-Eight Softail Twin Ca



External Breather System



Twin Cam 

Cable Operated 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 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.




2000-2015 Softail (cable operated throttle)


2000-Up Dyna (cable operated throttle)


2000-2007 Touring (cable operated throttle)



If you have a 2008-Up Touring Model, or a 2016-UP Softail, it has Throttle by Wire (TBW) and you can click this Link to see the TBW Transformer.


*Fits ALL Outlaw Air Cleaners.  

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

Does Not Fit oversized throttle bodies, like some use on builds upping the cubic inches.


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

Awesome Product Review by Colorado Kid
I have been waiting for awhile to get the Transformer. I really love it and it looks great on my 2012 Heritage. (Posted on 12/4/2023)
Swell Review by Biggus Dickus
Beautiful clean lines and design. No hoses!! Just what the doc ordered. (Posted on 3/20/2023)
Transformer and 636v intake Review by Fozzy
I purchased the transformer for my 2009 Fat Bob 96ci. I wanted to put an external catch can on the bike. I already had Vance & Hines big shot exhaust, Power Commander 5 and a K&N Intake on the bike but if I modified that intake you would see the hoses and fittings. So going with the Transformer made a very clean discreet look. No ugly hoses other than a 2" hose for the catch can.
Running with the DK 636v intake I did have to remap as it was running a little lean. Very happy with the results and it looks great too.
Thanks DK! (Posted on 7/7/2022)

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