Dorch N55 Stage 2 HPFP Upgrade

Dorch N55 Stage 2.5 HPFP Upgrade

Dorch Engineering
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Software changes are required to run this pump.

The table below serves as a reference for maximum fuel flow in cubic centimeters per camshaft revolution for various N55 fuel pump options. These calculations are based on the N55 cam lobe. Each engine will have varying fuel flow capacities depending on the lift and number of lobes on the camshaft.

Pump Model Fuel Flow (cc/rev)
HDP5 (Stock N55) 0.837
HDP5 Evo (Stock B58) 0.897
HDP6 (Stock B58TU) 1.107
Dorch Engineering Stage 1 1.221
Dorch Engineering Stage 2.5 1.465


Kit Contents:

  • HPFP w/ Hardware
  • High Pressure Line
  • Low Pressure Line
  • Low Pressure Line Bracket
  • Plug-n-Play Adapter Harness

Kit Fitment:

  • F87 – M2
  • F20/21 – 135i
  • F22 – 235i, 235xi
  • F30 – 335i, 335xi
  • F32 – 435i, 435xi
  • F10 – 535i, 535xi
  • E9X – 335i (ONLY 2013+ models originally equipped with Bosch HPFP)
  • E8X – 135i (ONLY 2013+ models originally equipped with Bosch HPFP)