DK Custom Products

Phone: 662.252.8828
Text: 662.420.4891

Complete Breather System Harley Sportster & Big Twin Evo

Availability: In stock
Item #: DK-ACI-EV-BR
Manufacturer: DK Custom Products

Harley Davidson Sportster Stealth Air cleaner support bracket  DK Custom breather vents OUTLAW HiFlow harley-davidson sportster, nightster, iron, 72, big twin evo evolution  48

 Complete Breather System



Sportster Models 1991- UP

Big Twin Evo's

DK Custom Products



  • Chrome Breather Bolts and Banjo Fittings
  • Washable Reuseable Filter
  • All needed hardware
  • Turn-Key System



A Breather Kit is needed to mount many aftermarket Intakes & Air Cleaners.  This kit will work with the OUTLAW HiFlow 587 Air Cleaner and many other aftermarket Stage 1 Air Cleaners*.

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 All Sportsters 1991 & Up (except XR1200)

Fits Big Twin Evo's

*Will work with the standard 1/8" thick support bracket, and some others that are up to 3/8" thick.

These can be routed for the filter to be above or below the air cleaner (above is better so that the oil will drain back into the engine).  You can also use a hose to route directly to the ground.

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.

Technical Info

Customer Reviews

Clean that engine up! It’s worth it! Review by Otto
The science behind this product makes sense to me. I have had my Iron 883 when it had only 5 miles on the odometer and I have put the other 8K on it in a few months. When I removed my A/C to clean out the supposd build up of oil spewing from the motor back into the A/C I was skeptical to find anything at all. But alas, there was a ton of oil slick all over the A/C parts and in the throttle body. I couldn’t believe it. The install was a breeze and it looks pretty slick installed. Could I feel the difference? Not really… but I’m more than sure it is improving the driving conditions of the motor having only cold clean air rushing through instead of regurgitated oil dookie fumes clogging things up. But that’s just like, my opinion, man. (Posted on 12/9/2017)

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