Audi B9 S4 Water/Methanol Injection (WMI) Kit

Water/Methanol/Alcohol injection commonly referred to as WMI allow you to make tremendous amounts of power on pump gas. The effect is similar to running 100 octane race gas or E85 fuel all the time with the additional cooling benefits allowing for more power than you can make on race gas or E85 alone.

The key to a safe and effective Water/Methanol Injection (WMI) setup is tuning integration. The Audi B9 S4 BMS Water/Methanol Injection (WMI) kit integrates to the JB4 tuning system allowing for precise mapping based on boost, throttle position, engine speed, intake temperature, advance, gear, and other data elements available to the JB4 through its CANbus system. In addition, a pump flow signal is fed back to the JB4 allowing for a safe and smooth progressive boost mapping. If the tank runs empty or flow drops for any reason the JB4 will safely back down performance to avoid detonation. Boost is held low until WMI is properly flowing to avoid tip in knock common with non-integrated WMI setups. In addition, WMI can be activated or disabled right from the JB4 Mobile app, will automatically disengage during traction control or safety map situations, and WMI flow data can be displayed via your JB4 Mobile logging device.

The BMS Audi B9 S4 Water/Methanol Injection (WMI) kit includes a high-quality Aquatec WMI pump made to our specifications, high-speed solenoid with leak-free compression fittings, a WMI filter, and all required wiring and mounting hardware. For the Audi B9 S4 you can select from our lower cost 1 gallon clear tank for a custom mount or our universal 2 gallon integrated tank.

For the Audi B9 S4 we also offer a unique direct fit CNC machined nozzle adapter allowing quick and easy installation of the suggested dual BM5 nozzles. The adapter eliminates the need to replace your otherwise sturdy factory chargepipe for nozzle mounting.

Dual BM5 is the recommended nozzles for Audi B9 S4 BMW engines with factory turbo.

What’s inside our water/methanol injection nozzles?

Audi S4 WMI Nozzle Adapter

This CNC machined plug and play adapter allows you to mount single or dual BMS WMI nozzles WITHOUT the expense and headache of removing and drilling your factory chargepipe. Shaves a ton of time off the Audi S4 WMI install and best of all is fully reversible. We suggest the BM10 nozzle for most S4 applications. Nozzles not included. Made in the USA.

 1 Gallon Universal Water/Methanol Injection (WMI) Tank

1 gallon universal tank: The least expensive option this tank is compact and flexible allowing for a wide range of mounting on any flat vertical surface in the trunk. The tank is clear to allow visually checking the fluid level. 

Comes with standard 2 way vented black plastic cap. 
Upgraded billet lid with 1-way check valve available below.

Tank dimensions: L 11″ x W 9″ x H 4.5″

Applications
Universal trunk mount

1.25 GALLON HEAVY-DUTY UNIVERSAL TANK

The Burger Motorsports 1.25 gallon heavy-duty tank is compact and flexible allowing for a wide range of mounting on any flat vertical surface in the trunk.  

This tank is thicker and stronger than our basic 1-gallon WMI tank. This tank features an easy fill filler nozzle, an anti-starvation reservoir with a pre-threaded bung for the included 90º compression pump feed fitting, a spill-catcher reservoir around the filler cap, a 2-way vented black plastic cap, and is translucent to allow visually checking the fluid level.

Comes with a standard 2 way vented black plastic cap/lid. Upgraded billet cap/lid with 1-way check valve available in the drop-down menu when ordering.

Tank dimensions: L 11″ x W 4.5 x H 9″

Applications
Universal trunk mount

2 gallon universal low profile tank
With our 2 gallon universal tank the WMI pump mounts directly to the tank for the ultimate easy to install tank. This tank is compact allowing for a wide range of mounting on any horizontal surface in the trunk. Offered in black and in clear to allow visually checking the fluid level. Works with all DDP 5800 pumps. Made in USA.

Comes with standard 2 way vented black plastic cap. 
Upgraded billet lid with 1-way check valve available below.

Tank dimensions: L 15.5″ x W 8″ x H 8.25″

Applications
Universal trunk mount

CAP UPGRADE

Optional Upgraded Billet WMI tank cap w/safety check valve

This high quality custom billet WMI cap includes an integrated check valve to let air in and prevent dangerous WMI vapor/fumes from getting out! Made in USA.

Applications
• BMS 1 gallon tank
• BMS 2 gallon universal tank
• BMS 2 & 3 gallon stealth tank