Dorch Engineering BMW N55/S55 - S63 EU5 Fuel Injectors

These are the genuine OEM injectors from the BMW M5's S63 engine, and the highest-flowing injectors in this family from Bosch. In terms of mechanical fitment, they drop directly into any N55 or S55 engine currently supported by Dorch Engineering's HPFP systems, making them the natural fueling upgrade once you're pushing past what the factory injectors can supply.

Fuel delivery capacity varies by fuel type: expect roughly 900-1000whp on E0/E10 gasoline, and 720-800whp on E85, depending on your specific supporting build and tuning. As Dorch Engineering themselves note, when pushing much beyond the flow capacity of a standard Stage 2 HPFP kit, the N55 becomes limited by its factory injectors, so upgrading to these at minimum is highly recommended to see the full benefit of a bigger fuel pump upgrade.

Please note: these injectors require coding via ISTA, along with proper tuning before running them. Most experienced tuners are already familiar with them, since they've been used successfully in high-powered S55 builds for years.

Why Choose These Injectors

• Genuine OEM Bosch injectors, originally from the BMW M5 S63 engine
• Highest-flowing injectors in this OEM family
• Direct mechanical drop-in fitment for supported N55 and S55 applications
• Roughly 900-1000whp capacity on E0/E10 gasoline, 720-800whp on E85
• Retains OEM fuel atomization quality and reliability under demanding conditions
• Kit includes 6x Bosch injectors and 6x BMW decoupling elements

Compatibility

• BMW F80 M3 (S55, all variants)
• BMW F82/F83 M4 (S55, all variants)
• BMW F87 M2 Competition (S55)
• BMW F20/F21 135i/135xi (N55)
• BMW F22/F23 235i/235xi (N55)
• BMW F30/F31/F34 335i/335xi (N55)
• BMW F32/F33/F36 435i/435xi (N55)
• BMW F10/F11 535i/535xi (N55, 2013+ with OE Bosch HPFP kit only)
• BMW F25/F26 X3/X4 35i (N55, 2013+ with OE Bosch HPFP kit only)
• BMW F15/F16 X5/X6 35i (N55, 2013+ with OE Bosch HPFP kit only)
• BMW E8X 135i, E9X 335i, E84 X1 35i, E70/E71 X5/X6 35i (N55, 2013+ with OE Bosch HPFP kit only)

Not compatible with: 2011-2012 N55 vehicles.

Kit Contents:

• 6x Bosch injector (BMW P/N 13537599876)
• 6x BMW decoupling element (P/N 13537577649)