DK Custom Products

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Text: 662.420.4891
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Discrete Head Breather System Harley Sportster & Big Twin Evo

Availability: In stock
Item #: DK-SPT-BRT
Manufacturer: DK Custom Products

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Harley Davidson Stealth 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

 Discrete & Flexible Breather System



Sportster Models 1991- UP

Big Twin Evo's

DK Custom Products



  • Fits almost All Air Cleaner Systems
  • Allows Discrete Placement of the supplied filter
  • Chrome Washable Reuseable Filter 
  • Includes 6 feet of hose for maximum flexibility in filter placement
  • All needed hardware
  • Uses Your OEM Breather Bolts with Nipples (not included)
  • Turn-Key System

 In the picture below you can see one of many different places you can affix the filter.  Please look at the additional pictures at the bottom to see how discrete this external breather system is.


An external Breather Kit is preferred with any Air Cleaner System.  This allows for only clean cool air to go into the air cleaner and engine, increasing performance and engine longevity.  This kit will work with the OUTLAW HiFlow Air Cleaner sand many other aftermarket Stage 1 Air Cleaners*.  It can even be used with the stock air cleaner.

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.

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

E-Z Install

Fits Most Sportsters 1991 & Up (except XR1200)

Fits Big Twin Evo's


*If your air cleaner system will accept the Stock OEM breather bolts that have a 3/8" diameter nipple, then this breather kit will allow you to route the hot oily air to the supplied filter that you can place anywhere you like.  The OEM breather bolts are not supplied, must use the ones that came with your bike when stock.

This kit does Not work with air cleaners that have thick stand-offs, like the AN BS and others of similar design.  For those style air cleaners, use the EBS kits seen at this LINK.

 Filter may, or may not, have a small loop in it.  This does not affect the aesthetics or installation choices. The filter may also vary in size, color and shape.


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.

Larry’s Discrete Head Breather System on 2015 Tri-Glide with Rushmore A/C with the Stock Cover

(also used a Vented Chrome Catch-Can, which you can see HERE)


Hope this will help someone else with their installation.


The pictures are as follows:



#1 - K&N air filter with nylon plug in hole where stock hose was.




#2 -  Stock hoses connected to hoses in kit, and exiting bottom of air filter housing through hole I had to drill.





#3 - Hose running on top of cam cover. ( I put a piece of split nylon wire wrap over rubber hose to protect it from heat and rubbing )




#4 - Hose routed on left side of oil pressure switch.





#5 - Hose routed on left side of rear brake control cylinder.




#6 - Hose coming straight down and secured with wire tie. Catch can is very secure and easy to access.





#7 Air filter installed. There is plenty of room for it and the breather hoses. Works great, and I think it looks fairly good.


Customer Reviews

made easy Review by tes
pricey buy nice to have all the parts that are needed, took longer to decide where to run the hose than to do the instal. (Posted on 1/18/2023)
Expensive for what you get! Review by Phil
Filter, 3 clamps some hose, tee connect and zip ties. Really expensive for what you are getting. Guess you pay for the convenience. They are no rubber grommets for after the back plate holes you drill. Had to buy those. Would have been a 5 star for quality otherwise. Simple to install. Makes sense to do the mod.

DK Team Note-

We do not recommend, nor do we see a need for any rubber grommets for this install. (Posted on 1/27/2021)
Very happy Review by Lou
I’ll start by saying that the customer service was outstanding. The kit was easy to install and will hopefully help keep the carbon buildup to a minimum. The convenience of having a complete system as opposed to walking up and down store aisles shopping more than makes up for the few dollars that I paid DK. (Posted on 1/23/2021)
Offered as an option with 828 ac Review by JACK
This breather system was offered as an option with the 828 ac and it doesn't work without having to drill holes into the 828's backing plate. I had to order a "banjo" style breather manifold in order to use the hoses and filter. I feel that it shouldn't have been offered in the drop-down menu under breather system of the 828 ac.


Jack, you are correct, it should not be an option without disclosing that it requires that. My apology, and we will correct that on the site.

DK Support Team (Posted on 10/1/2020)

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