Fuel-It BMW N55 F-Series Port Injection Kit for M2, M135i, M235i, 335i and 435i
Unlock dependable fueling for big power on your BMW N55. The Fuel-It port injection kit is the proven N55 E85 solution that adds supplemental port fuel injection to support higher horsepower on pump fuel or ethanol blends, including up to 100% E85 on stock or upgraded turbos. If your HPFP is at its limit, this N55 port injection kit delivers the extra fuel your build needs with a clean, reversible install and OEM-level reliability.
Perfect for BMW M2, M135i, M235i, 335i and 435i F-Series owners seeking more power, better ethanol compatibility and rock-solid fueling. We use this kit on our own N55 builds and our customers consistently report smoother power delivery, stable trims and easy tuning. A best-selling upgrade for N55 E85, flex fuel and high-boost setups.
Why choose this N55 Port Injection kit
- Run up to 100% E85 with confidence on stock or upgraded turbos
- Solves HPFP limitation by adding precise supplemental fuel under boost
- No permanent modification required and installs between intake manifold and cylinder head
- Includes flow-matched Bosch 52 lb injectors for consistent cylinder-to-cylinder delivery
- Beautiful black anodised Fuel-It manifold spacer and fuel rail for OEM-plus fit and finish
- Dual fuel supply port supports inlets in the stock location. Contact us for guidance
- Optional return port for upgraded fuel pressure regulator setups
- Multiple kit options to suit your goals and budget, from Basic to Bluetooth ethanol monitoring
What is port injection
Port fuel injection adds an injector rail and spacer between the intake manifold and cylinder head to supplement the factory direct injection. On the N55 this is the ideal way to add the fueling headroom required for ethanol, higher boost and bigger turbos, while keeping drivability and reliability. It is a straightforward install that can be reversed at any time.
Choose your kit
Basic kit
Note: the Basic kit does not include any fuel lines.
- Fuel-It custom black anodised intake manifold spacer
- Fuel-It custom black anodised fuel rail
- Black anodised aluminium and stainless steel hardware
- Dual fuel supply port for stock-location inlets. Contact us for info
- Optional return port for upgraded fuel pressure regulator users
- Six flow-matched Bosch injectors (52 lb)
- Extended-length steel studs and mounting bolt for the spacer
- BMW OEM gaskets
Bronze kit
- Everything in the Basic kit
- Basic fuel line connection kit:
- Two custom Fuel-It fittings to retain stock fuel line connections at the HPFP and engine bay feed
- -6AN 3/8 inch upgraded fuel lines
- High-flow Y adapter
- 90-degree elbow for the fuel rail connection
Silver kit
- Everything in the Basic kit
- Basic fuel line connection kit
- Upgraded fuel line that completely replaces the stock fuel line
Gold kit
- Everything in the Silver kit
- Integrated ethanol sensor for ethanol content monitoring when used with an ethanol analyser
Platinum kit
- Everything in the Silver kit
- Integrated ethanol sensor
-
Bluetooth and JB4-compatible ethanol analyser with 0 to 5 volt output
- Bluetooth requires a separately purchased iPhone or Android app
Compatibility and fitment check
Designed for BMW N55 F-Series M2, M135i, M235i, 335i and 435i. To ensure perfect fitment, we run a compatibility check prior to dispatch. Enter your UK registration or the last 7 digits of your VIN at checkout and our team will confirm before shipping.
Installation and fitting
This is a straightforward install for experienced enthusiasts or professional workshops. For hassle-free fitting, we recommend booking with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Shipping, usage and warranty
- Built to order. Please allow 2 business days for shipping
- For off-road use only
- Manufactured by Fuel-It
- One-year Fuel-It warranty
Part number
F-N55-PI-BA-BA-550
Important note on ethanol sensors
Ethanol sensor readings are derived from the absence of petrol content. If your fuel is contaminated, displayed ethanol content may read artificially high.
Common search terms: BMW N55 port injection, N55 PI kit, Fuel-It N55, BMW M2 port injection, M135i E85 kit, M235i ethanol kit, 335i port injection fuel rail, 435i flex fuel, N55 supplemental fuel system, N55 E85 upgrade, N55 HPFP upgrade support, N55 intake manifold spacer, N55 Bosch injectors, -6AN fuel lines, JB4 ethanol analyser.