We proudly introduce a game-changing innovation for the BMW N55 community. With this cutting-edge solution, fuel flow increases by up to 49% compared to existing Dorch N55 HPFP kits — unlocking a new era of power based on the factory direct-injection system.

Built from genuine BMW vacuum pumps, each unit is internally upgraded with Dorch Engineering’s proprietary camshaft, precision-machined and tested using in-house production tools. The result? Massive fuel flow gains in a clean, OEM-style package — fully maintaining DME control, reliability, and safety. This is direct injection performance redefined.

Performance Table – N55 Lift Kit

Technical Notes

When combining the N55LK with DS25 HPFP (or DS2), a minimum power threshold is required for smooth tuning. Below that level, calibration may be unstable.
For DS15 HPFP (or DS1) setups, there is no such limit — we always recommend using the +49% N55LK version for maximum results.

Tuning & Support

Software adjustments are required, but preconfigured maps are available in Bootmod3 and soon in MHD. Simply enable the “Lift Kit” option when flashing.

For setups exceeding HPFP Stage 2 limits, injector flow becomes the restriction. To unleash full potential, we recommend OEM BMW S63 EU5 injectors, capable of supporting up to 800whp on full E85.

Kit Contents

• Dorch lifetime warranty

• Dorch vacuum pump

• HPFP LK mounting flange

• Vacuum pump block-off cap

• Pump gasket

Applications

• F87 – M2
• F20/21 – 135i, 135xi
• F22/23 – 235i, 235xi
• F30/31/34 – 335i, 335xi
• F32/33/36 – 435i, 435xi
• F10/11 – 535i, 535xi *
• F25/26 – X3/X4 35i *
• F15/16 – X5/X6 35i
• E8X – 135i *
• E9X – 335i *
• E84 – X1 35i *
• E70/71 – X5/X6 35i *

Compatible with 2013+ BMW N55 engines equipped with Bosch HPFP.
Not compatible with 2011–2012 N55 models
Not compatible with Continental HPFP