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Precision Raceworks BMW N54 N55 Series Boost Reference Harness (Inc. 1M, M235i, 335i, M3 & M4)

Precision Raceworks

  • £69.85
    exc. VAT £58.21


The Precision Raceworks BMW Boost Referenced Pump Activation Harness is the preferred method to control auxiliary fuel pumps by pump manufactures and tuners alike.

This kit is considered the most complete and highest quality kit on the market and is sold private label to many BMW pump manufactures.   That is why this harness is the #1 method of secondary pump control on the market around the globe.

Each kit includes a boost referenced pressure switch often referred to as a "hobbs switch" however our pressure switch is designed for exposure to oil as well as air and is safe for engine bay temperatures for years of reliable service unlike a "hobbs switch" which is deigned for use in swimming pool and hot tub applications.



  • 10 Gauge Oxygen Free Copper Wire
  • 100% Plug & Play (zero cutting, stripping, crimping)
  • Pre-set 13psi boost reference switch designed for automotive use



  • Weight: 2.1 lbs
  • Boost Referenced: Yes
  • Plug and Play wiring: Yes
  • Connection style: OEM Quick Connect
  • Pressure set point for activation: 13psi
  • Fuse size pre-insalled: 30amp
  • Pressure Switch (hobbs switch): Included


    Compatibility Check

    To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 



    • BMW 1 Series 128i 2007-2013 (E8x)
    • BMW 1 Series 135i/135is 2007-2013 (E8x N54/N54)
    • BMW 1 Series M135i 2012-2016 (F2x N55)
    • BMW 2 Series 228I 2014-2017 (F2x)
    • BMW 2 Series M235I 2014-2017 (F2x)
    • BMW 3 Series 323i 2006 (E9x)
    • BMW 3 Series 325i/325xi  2006-2013 (E9x)
    • BMW 3 Series 328i/328ix 2007-2013 (E9x)
    • BMW 3 Series 330i/330xi  2006 (E90/E91)
    • BMW 3 Series 335i/335is/335ix 2007-2013 (E9x) N54 N55
    • BMW 3 Series 320I 2014-2018 (F3x)
    • BMW 3 Series 328i/328ix  2012-2015 (F30/F31/F34)
    • BMW 3 Series 335i/335ix 2012-2015 (F3x) N55
    • BMW 4 Series 428I 2014-2016 (F3x)
    • BMW 4 Series 435I 2014-2016 (F3x)
    • BMW M Series 1M 2011-2012 (E82)
    • BMW M Series M2 2016-2018 (F87)
    • BMW M Series M2 Competition 2019+ (F87)
    • BMW M Series M3 2008-2013 (E9x)
    • BMW M Series M3 2015-2018 (F80)
    • BMW M Series M4 2015-2019 (F8x)
    • BMW X Series X1 2009-2015 (E84) 


    Manufactured by

    Precision Raceworks


    Part Number


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    We ship worldwide via DHL International, simply enter your full address at checkout to see the shipping option(s) and quote(s). Same day dispatch available if your order is placed before 1pm UK Time on all in stock items!