Spool Performance Split Fuel Surge Tank – BMW DI + PI Fuel Systems

The Spool Performance Split Fuel Surge Tank is designed for high-output fuel systems that use direct injection and port injection together. Its split architecture isolates the DI and PI supply circuits to reduce pressure-pulse interaction and improve stable fuel delivery under high load.

• Billet 6061 aluminium construction
• Separate direct-injection and port-injection fuel circuits
• Supports one dedicated DI pump and up to three PI pumps
• Supports boost-referenced port-injection fuel pressure
• Plug-and-play wiring harness with appropriately sized relays and fuses

Selectable configuration: choose the required regulator package and pump-count configuration from the options below. Pricing changes with the selected hardware configuration.

Fitment: intended for serious BMW DI + PI fuel-system builds. Confirm the required pump, regulator, hose and mounting layout for your vehicle before ordering. Workshop installation is available.

Supplier

Spool Performance

Product System

• Fuel System

Available Options

Regulator

• Yes Include DI and PI regulators
• No I will use my own regulators

Number of pumps to include

• 1 DI || 3 PI
• 1 DI || 2 PI
• 1 DI || 1 PI
• Do not Include pumps

Supplier Part Numbers

ML-SP-UST-4-2-REG-1DI3PI, ML-SP-UST-4-2-REG-1DI2PI, ML-SP-UST-4-2-REG-1DI1PI, ML-SP-UST-4-2-REG-NOPUMP, ML-SP-UST-4-2-NOREG-1DI3PI, ML-SP-UST-4-2-NOREG-1DI2PI, ML-SP-UST-4-2-NOREG-1DI1PI, ML-SP-UST-4-2-NOREG-NOPUMP

Built by Boost & Tune Support

BBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.