DK Custom Products

Phone: 662.252.8828
Text: 662.420.4891

DIY Head Breather System Touring Softail Dyna Sportster

Availability: In stock
Manufacturer: DK Custom Products

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DIY Head Breather System Touring Softail Dyna Sportster DK Custom Harley Davidson High Flow EBS Outlaw M-8 Milwaukee-Eight Stage I Trike Tri Glide Freewheeler Big Twin Evo Sportster

 DIY Discrete Breather System




DK Custom Products



  • Fits All Air Cleaner Systems w/ Stand-off back plates
  • Allows Discrete Placement of the supplied filter
  • Chrome Washable Reuseable Filter - flexible placement
  • Includes 6 feet of hose for maximum flexibility in filter placement
  • DIY Kit requires drilling & tapping 
  • Includes Step-by-Step instructions


In the picture below you can see the stand-offs that are part of the backplate (that butt up against the heads).  This system includes hose barbs that can be threaded into those stand-offs and allow you to vent externally, as discretely as you would like.

This Picture is showing an Ness Big Sucker Air Cleaner that has our Sano Black Air Cleaner Cover, specifically made for Big Suckers & HD Stage I Air Cleaners.  You can see this cover HERE.


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 DIY kit is designed for aftermarket Stage 1 Air Cleaners that don't allow for venting out the end of the breather bolt.  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!

Fits All Twin Cam & Milwaukee-Eight Models - 2000-Up Touring & Softail, 1999-Up Dyna

Fits All Sportsters & Big Twin Evo Models - 1991 & Up


*This kit requires drilling (11/32" drill bit) and tapping (1/8" NPT Tap) threads into the stand-offs (that are part of the backplate).  The benefits are that you can completely hide the hoses, if you wish, and it will work with air cleaners where no other external venting system will work.

Drill bit & Tap kit is an option above.


If your air cleaner system will accept the Stock OEM breather bolts, we have other breather kits that are straight bolt on, not requiring any drilling or tapping.  You can see the one for the Sportster HERE, and the one for the Twin Cams HERE

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 shape, size and color.


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.

Below are some photos showing various stages of Installation on several bikes. 

For full instructions, please look at the Instructions tab.













Customer Reviews

Excellent product! Review by Kent reed
I did a stage 4 128ci on my 2021 Harley Davidson Road King and discovered a lot of thick carbon build up on my stock pistons with only 8000 miles on it caused by oil blow by! Installed the DIY external breather kit that fixed my problem! (Posted on 8/18/2022)
Best thing for my Harley Review by External Breather
So happy with this product. Was easy to install and I have noticed a difference in the way the bike runs. Was always tired of wiping out the air filter cover from excess oil. No need for that any longer. Thank you DK Custom! (Posted on 5/24/2022)
This couldn’t be easier! Review by 08FLHRCI
The whole process was very straight forward, everything connected up and took no time at all. Great kit, I should have bought the drill bit and tap! (Posted on 10/24/2021)
Good Review by Dcauto10
Good (Posted on 7/22/2021)
Good Product Review by Dom
Kit was complete and easy to install, the only change I made was to use a catch can rather than the filter. Just personal preference.
Kit installed on a 2012 FLS Softail. (Posted on 5/20/2021)
So simple to do it Review by Breakout
First full I would like to thank DK custom for such DIY product and their suggestions while placing an order ,
It was so simple to install it and as per customer choice ..

I am sure it will work for ever . (Posted on 4/19/2021)
Great Product Review by Scott Sheets
Ordering was fast and simple. Product came very quickly. Install was easy with basic tools and knowledge required. The hardest part for me was just getting the filter in place, working just off the jiffy stand limits ease of placement. Overall great product I had oil definitely blowing by and my throttle body had a ring of oil around the butterfly. I have a 2018 Sport Glide and I installed it close to 4000 mi so hopefully it's good to go.
DK (Posted on 1/27/2021)
Convenience of kit. Review by Mike
The kit had everything I needed for installation. The quarter inch pipe tap worked great and it was nice having the proper bit size included. The installation went without a hitch. I’m going to install their oil filter re locator next oil change. (Posted on 7/30/2020)
Quality products 2016 Heritage Review by HARLEYJOE
Getting a lot of oil in air cleaner installed the kit very easy. Everything I needed top notch parts and service. I ordered the coil relocation kit also fit perfectly very satisfied. Would recommend DK if you want quality parts and great service. I’m going to order the oil filter relocation kits next when they have a sale Thanks Joe (Posted on 5/26/2020)
DIY Head Breather Review by Fred
Was Getting Blow By on My 18 Road Glide Special Now an then,Would be oil on Right Saddlebag an bottom of Air Cleaner.I run a Arlen Ness Big Sucker Under Stock Cover.This kit allows you to hide filter good.Have put 300 miles on no more blow by.Easy to install good instructions. (Posted on 8/12/2019)
External Breather Review by Rod
Works great so far, installing was simple with easy to follow instructions (Posted on 5/20/2019)

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