DK Custom Products

Phone: 662.252.8828
Text: 662.420.4891
Email: [email protected]

Naked Stage I HiFlow 606 Air Cleaner Back-Plate w/ NO Filter Element Sportster

Availability: In stock
Item #: DK-AC-606-S-NF
Manufacturer: DK Custom Products

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Harley Sportster HiFlow 606 Air cleaner DK Custom Nightster Iron 48 High Flow Harley Davidson Custom Low SuperLow naked performance air cleaner 606 intake kit Ness Big Sucker K&N EBS External Breather System Carbureted EFI Stage I

Outlaw HiFlow 606 Back-Plate

Air Cleaner 

(No Filter Element*)


Sportster Models 1991-UP

~High Performance System~

 ~Fits EFI & Carbureted~

MADE in The USA!

DK Custom Products



  • NO Filter Element Included*
  • Includes Mounting Stand-offs 
  • Support & Backplate Black Powder Coat Finish
  • Naked- No Plate Cover
  • External Breather System - EBS (NO dirty air in motor)
  • A True Stage I Air Cleaner
  • E-Z Step-by-Instructions Included
  • Made in The USA!


*If you already have an HD-0800 Filter Element

Like found on a Big Sucker or HD SE Stage I air cleaner 

You can use the HD-0800 Filter Element with this Air Cleaner System 


The Big Sucker and Screamin' Eagle air cleaners need modifications to vent externally. 

The back-plate & support bracket, in this kit, allow for fitment of an included BOLT-ON External Breather System, using your existing HD-0800 filter element.


The Outlaw HiFlow 606 System will give your Sportster the Air it needs to Produce Maximum Power.  CLEAN AIR - No dirty air routed back in! 

E-Z Installation with Step-by-Step Instructions.

Fits Carbureted & EFI Sportsters 1991-Up.

This is a must for at Stage 1 Upgrade.


Included: Your Choice of Brass, Black or Polished Aluminum Breathers.  Or you can choose one of the Hose & filter Breather Systems for venting - The Traditional, the Discrete, or the Premium Discrete  To see full details on All these choices Click  HERE

When choosing between the 6 Breather systems, it is helpful to know-

 1.  All three Breather Bolt function the same, it is just a matter of which color you prefer.

 2.  All of the Hose and Filter/Catch-Can Breathers function the same with the Outlaw Air Cleaners, it is a matter of which system you like the looks of the best. 

The Transformer™ is the Ultimate External Breather System, that Doubles as a Support Bracket and can be Transformed into an EPA (Emissions) Compliant System. It fits all Outlaw Air Cleaners.

This 606 comes with no cover.  A cover is not needed, and you can run it this way, or let your imagination run wild and secure any cover you want to it via, the center bolt in the filter element.


Just about any HD or aftermarket cover (round, teardrop, etc.) will fit over it, or use a CD or make something, or you can Choose one of the Covers we have at this LINK.


You can upgrade to the Outlaw HiFlow 606 Air Cleaner System without doing any dyno work or adding tuners IF you leave the stock exhaust in place.

The EPA has required Harley to route dirty, oily crankcase air back into the air cleaner compromising the performance of your engine. The External Breather System vents it without compromising the performance or longevity of your motor.

NO FILTER ELEMENT IS INCLUDED WITH THIS KIT.  This kit is designed for those that already have a HD-0800 Filter Element.

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.

Check out the Dyno Chart!  21% increase when combined with the Thunder Torques.

"I had a Big Sucker, but wanted to vent externally.  This was the perfect answer, since it allowed me to save $ by using my filter element off the BS on this Air Cleaner that already vents all that blow-by externally.  Thank you for making this!-Craig

"Bike runs amazing with addition of this air intake and external breather..
I've bought many aftermarket parts for cars mx bikes. Nothing has ever come close to the difference this intake has made. And best customer service I have Ever experienced." -EK


Customer Reviews

606 Naked kit Review by Milwaukee Chris
I bought this with the transformer. I still had a good filter and face plate, so this was the perfect kit. The kit has everything you will need. Install was a breeze. High quality product. Very pleased with looks.
(Posted on 2/14/2023)

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