SPOOL Performance

Spool Performance BMW Auxiliary Fuel System

When adding port injection to a high-power BMW, the low-pressure fuel system needs to be designed correctly. Running the factory direct injection and port injection systems from the same fuel supply can create pressure fluctuations and fuel starvation as demand increases.

Most upgraded low-pressure systems operate at static pressure. As boost rises, the effective pressure differential across the port injectors decreases, forcing the calibration to rely heavily on injector compensation tables. The higher the boost, the larger the potential error becomes.

The Spool Auxiliary Fuel System gives the port injection system its own dedicated feed, return and boost-referenced regulator. Fuel pressure rises 1 psi for every 1 psi of boost, maintaining consistent pressure differential across the port injectors. This provides more predictable injector flow and accurate fuel delivery under load.

Separating the DI and PI fuel supplies is especially important at higher power levels. When both systems compete for the same fuel source, pressure instability can affect the factory high-pressure system and contribute to damaged DI injectors. Our system allows the factory direct injection system and supplemental port injection system to operate independently.

What’s Included

* 2 genuine Walbro fuel pumps
* 2 genuine Walbro fuel filters
* Spool platform-specific dual-pump bracket
* Spool high-flow 10-micron stainless-steel fuel filter assembly
* Dedicated PTFE crimped feed and return lines from the fuel tank to the fuel rail and regulator
* 2 ground-activation wiring harnesses for pump control
* Genuine low-profile Radium DMR boost-referenced fuel-pressure regulator
* Injection-molded plastic fuel-pump top hat manufactured to the same design as the OEM unit for simple plug-and-play installation and proper sealing

The Spool Auxiliary Fuel System is a complete, cost-effective fueling solution built with genuine components from brands you already know and trust. No questionable pumps, generic regulators or leak-prone aftermarket top hats—just proven parts, proper fuel-system architecture and everything required for a clean installation.

It’s nice to have good friends like DSMlights - Edgard that recommend parts and you just buy them Noel Valdivie Cabrera 🫢

Long time supporter and forever family here, these guys always reppin our stuff in Miami.

Built transmission for 2 years taking all the abuse by these loco Cubans , the car has seen more motor failures then it has on failed transmission parts. Owner finally decided to take it upon himself to build his own motor.

Enough need to be said here? Results speak for themselves.

Precision Turbo & Engine MHD Tuning MOTIV Motorsport Half Price Auto Repair Noel Valdivie Cabrera Edwin Yong 1320_motorsport

1440WHP BMW M4

For those in the back that have cars that don’t work—here’s a special one for you! 😉

Powered by Spool Performance
Spool 8HP76 Built Transmission
Spool Cog Drive
Spool Billet D Drum
Spool Billet Shafts
Spool ATC-13 Transfer Case
Spool Torque Converter
Spool Fueling
Precision 73.9R
Half Price Auto Repair Motor Build and Work

WHEN POWER GOES UP, LEVEL UP YOUR B58 DRIVETRAIN WITH SPOOL PERFORMANCE! 🏋🏻‍♂️

💪🏼 8HP51 Stage 2 Upgraded Transmission DIY Parts Kit:
• Handles 1000+ Lb Ft torque, Stronger, Durable Billet 7075 Clutch Hubs, Upgraded Friction & Clutch Packs.

💪🏼 BMW B58 Billet Race Torque Converter (No Core Needed):
• Aggressive Launch + Daily Driving friendly, 3800-4000RPM High Stall, Billet strength for Bigger Power builds.

Whether you're driving M Performance cars or tuned B58 monsters in India, these are the transmission upgrades that future proof your drivetrain before power breaks it. WhatsApp on +919910905555 to enquire & order. 📲

THE WEAKEST LINK SHOULDN’T BE YOUR GEARBOX! ⚙️

Our flagship turbos for the Mercedes AMG M177.1 and M178 featured in the C63/GLC63 & AMG GT/GTS/GTC/GTR are now on sale for $4999 available on the website supporting up to 1200HP to the engine.

No code required to take advantage!

No core requirement
Dual ceramic ball bearing CHRA
MAR-M246 alloy turbine
Billet compressor wheel
Stainless steel housing

The finest casting you can get, you’ll see a true work of art once you receive these in your hand.

Available in any color for an additional charge

Spool Lamborghini Urus and Audi RSQ8 Downpipes are now available on our website to purchase. These are best fitting downpipes for these cars and they don’t have a horrible finish after 1 or 2 heat cycles.

Available in race downpipe and 200 cell variant

In-stock and available for shipment on our website or contact one of our dealers worldwide if interested!

Ricky’s 901WHP AMG GTC Convertible

Featuring our full catalog, is there anymore needed to be said?

Spool HPFP
Spool Turbos
Spool LPFP
E40, no m**h at all…

Good driveability

Products available on our website—built to order!

Spool Mercedes AMG M178 GTC making 844whp at Eurocharged Austin

Swipe for dyno pull 🐌🫡

This car is equipped with our full catalog

- Spool FX-350 HPFP
- Spool Stage 3 LPFP
- Spool IFX1200 Turbos
- Spool Race Downpipes for M178 GT
- Spool Stage 2 Clutch
- Eventuri Carbon Intakes for M178

Huge shoutout to Eurocharged Austin for wrapping this project up for us. They’ve been a huge help and congrats to the owner! For any performance or service needs for your AMG in Austin, EC Austin is the place to go!