DK Custom Products

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

Complete HiFlow 425 Air Cleaner Sano Black for Harley Twin Cam

Availability: In stock
Item #: DK-AC425-BLK-TC
Manufacturer: DK Custom Products

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Complete HiFlow 425 Air Cleaner Sano Black for Harley Twin Cam DK Custom Harley Davidson Outlaw Air Cleaner Systems Complete EBS  High Flow M-8 Milwaukee-Eight Softail Twin Cam Sportster Roadster Dyna 72 48 Big Twin Evo Nightster Iron Stage I Ness Big Suc

Outlaw HiFlow 425

Air Cleaner System


Touring~Softail~Dyna Twin Cam Models

~Complete High Performance System~

 ~Fits EFI & Carbureted~

Complete HiFlow 425 Air Cleaner Sano Black for Harley Twin Cam

MADE in The USA!

DK Custom Products



  • HiFlow 4 1/4" Genuine K&N Air Filter
  • Super Low Profile - best leg clearance
  • Support & Backplate Black Powder Coat Finish
  • Sano Powder Black Face Plate Cover
  • Your Choice of External Breathers (NO dirty air in engine)
  • All Hardware needed, including Stainless AND Brass Acorn
  • E-Z Step-by-Instructions Included
  • Made in The USA!

Complete HiFlow 425 Air Cleaner Sano Black for Harley Twin Cam 

The Outlaw HiFlow 425 System will give your Twin Cam the Air it needs to Produce Maximum Power.  CLEAN AIR - No dirty air routed back in! 

This system is TURN-KEY.  It comes with everything needed to replace the restrictive stock air cleaner.

Check out the Dyno Chart.  This little Monster shows off your motor AND flows More air than a 103 CI can eat!

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

Genuine K&N Filter with Million Mile Warranty.

Filter is re-usable.  Simply wash, let dry, & apply oil.

Fits Carbureted & EFI Touring, Softail, & Dyna Twin Cam Models.

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 three of the Hose and Filter 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 System comes with a Sano Black Powder Face Plate Cover.

You can upgrade to the Outlaw HiFlow 425 Air Cleaner System without doing any dyno work or adding tuners IF you leave the stock exhaust in place.

This kit comes with both a Stainless and a Brass Acorn Fastener for the Cover. 

There are Optional A/C Cover Fasteners that you can add to your order. 

44 Magnum, The Gripper, Tri-Speed, Speed, Tri-Shield and Mini-Tri-Shield.  Any of these will add to Your Bikes Unique Look. 



2000-2015 Softail (cable operated throttle)

2016-UP Softail (Throttle by Wire TBW)

2000-Up Dyna (cable operated throttle)

2000-2007 Touring (cable operated throttle)

2008-Up Touring (Throttle by Wire TBW) The 425 will NOT fit, the 587 will.

If you have a 2008-Up Touring Model or a 2016-UP Softail, it has Throttle by Wire (TBW) and the Outlaw HiFlow 425 will NOT fit.  The Outlaw HiFlow 587 WILL fit. (it is not a matter of air flow, Throttle by Wire throttle body that is incompatible with the 425.


If you have a 08-Up Touring Model and would like to hide the Ugly TBW Servo Motor CLICK HERE for a selection of Servo Covers.

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

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.

The Sano Cover is the perfect canvas for you to customize with paint or a decal, and you can just turn it around if you ever want just plain black.

"I dig your air cleaners cause it's such a great platform to personalize your bike.  And you can do something different on either side and just flip from one side to the other for a different look.-Bart

Customer Reviews

Great product Review by Bill
looks great. Will notice big difference in performance. Easy to install. (Posted on 8/23/2022)

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