BMW F-Series N55 Spool FX-200 Stage 2 High Pressure Fuel Pump

The Spool FX-200 is a Stage 2 upgraded high pressure fuel pump for F-chassis BMW N55 engines that roughly doubles stock flow.

Why you need it

The stock high pressure pump on the N55 is badly limited when you tune for more power. The FX-200's bigger bore roughly doubles flow, raising the fueling limit so you can run bigger turbos and higher ethanol blends. It replaces Spool's earlier FX180 and is plug and play with no cutting or splicing.

Fits

• BMW F-chassis models with the N55 engine

Features

• About double the flow of the stock pump
• E85 compatible
• Plug and play, no cutting or splicing

Good to know

Choose at checkout whether to add the Spool wireless ethanol analyzer kit, use one you already have, or skip it. You can also add the Spool 10-micron filter unit. The pump requires calibration changes, and they must be in the tune before you start the car with the pump installed. Spool can share calibration details with your tuner but does not write custom tunes. Proper low pressure fueling matters on a direct injection system: the high pressure pump is lubricated by fuel, and a weak low side can damage the piston and bore. Plan a low pressure pump upgrade alongside this pump. Professional installation is recommended.