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External Breather Systems   

HPi's External Breather system is an add on feature manufactured to fit the HPi V2 and Billet-Pro air cleaner kits best.  The design helps eliminate oil misting on bike and contamination of intake tract with a fully o-ringed system, billet stainless steel inserts and vacuum tube design.  Purpose built to retro fit other select air cleaner kits that use a flat mounting back plate, but not a guarantee fit with other air cleaner manufacturers.  Allows for a slight misalignment of air cleaner due to head/throttle body fitment issues.  We cannot accept kits for return after attempt installation.  *Please note, not yet available for Sportster® units.  Fuel Injected models only. *Please allow up to 10 days to ship.  Lead times may be longer than expected.*

       Part #                 Description                                                                                Price $

  • HPI-EBS-CD       Cable Driven Ext Breather                                                         $105

                                Spacer Measurement 1.500
                                *2001-2005 & 2006-2016 Big Twin/Twin Cam


  • HPI-EBS-FBW    Throttle-By-Wire Ext Breather                                                  $105

                                 Spacer Measurement 1.750
                                 *2008-2016 H-D
    ®  Big Twin


  • HPI-EBS-M8       Milwaukee 8® Ext Breather                                                      $105

                                 Spacer Measurement .940
                                 *2017-Later Milwaukee Eight
    ® Models

*Hose Details - 3mm 1/8 ID, High Performance Silicone Vacuum Hose

Install Instructions:

Screw the bolt out of the insert and then pull black spacer off the stainless part and you will see wrench flats for a 9/16 wrench.  Install into head with red loc tite, then install the spacer back on the insert with the nipple side towards the head.  Install back plate, insert bolt back in, do not use loc tite on that bolt.

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