BMS 3.5 Gallon Stealth Water/Methanol Injection (WMI) Tank for G20 G22 & G80 M3 & G82 M4 BMW

Stealth Tank for G20 G22 & G80 M3 & G82 M4 BMW tucks neatly in the side pocket of your trunk!

This water/methanol injection (WMI) tank is a completely custom design that neatly hides away in the left side trunk cavity found in most G20 G22 & G80 M3 & G82 M4 BMW vehicles. The pump mounts directly to the back of the tank allowing for a quick, clean, and completely stealth installation. The bottom of the tank includes a rear sump allowing for consistent performance even as the tank drains. Includes 2-way vented black plastic cap and a compression pump feed fitting. 

Optional upgraded blue billet water/methanol injection (WMI) with 1-way check valve available here.

Burger Motorsports DDP 5800 water methanol alcohol Injection pump available  here.

The nozzles are determined by the intended power and how many bungs your charge pipe has. The nozzles are 1/8” NPT and screw into bungs included on most aftermarket charge pipes. Our BMS “super atomizing” nozzles are well known for their great atomization and flow characteristics. The nozzle number represents the approximate gallons per hour of fluid when at full flow. Generally speaking, running two smaller nozzles is preferred to one larger nozzle for an equal flow to improve fluid atomization and distribution. Below are some general nozzle suggestions but feel free to email us for nozzle advice if your situation is unique.

Features & Benefits

• Leaves trunk completely clear for full use of space
• Super low profile design tucks neatly into the existing left side trunk cavity
• 3.5 Gallon (13.25 liters) capacity 
• Available in transparent white for visually checking fluid levels and opaque black for a stealth appearance. 
• DDP 5800 pump mounts directly to the tank (pump sold separately)
• Includes 2-way vented black plastic cap
• Optional upgraded blue billet lid with 1-way check valve available here.
• Includes all mounting hardware

Tank dimensions: L 20.5″ x W 11″ X H 13.5″

Vehicle Fitment

BMW M3
• 2021+ S58 G80 BMW M3
• 2021+ S58 G80 BMW M3 Competition

BMW M4
• 2021+ S58 G82 BMW M4 (requires modification to fit)
• 2021+ S58 G82 BMW M4 Competition (requires modification to fit)

BMW 3 Series
• 2020-2023 G20 B58 BMW M340i including xDrive

BMW 4 Series
• 2021+ G22 BMW M440i including xDrive (requires modification to fit)

What’s included:
(1) Stealth Tank
(1) 2-way vented black plastic filler cap
(1) brass Compression Tube Fitting for 1/4″ Tube OD x 1/4 NPT Male
(1) 18″ of line
(2) Powder coated stainless lower bracket
(2) Rubber lower bracket grommets
(2) BMS custom bell washers
(2) Stainless Steel Flanged Button Head Screws M6 x 1 mm Thread, 8 mm Long
(1) Plastic upper bracket
(2) Self Tapping upper bracket screws 1/4″ Size, 1-1/2″ Long
(4) Pump Screws – Phillips Passivated Stainless 10-32 Thread, 1-1/4″ Long
(2) 1/4 push male to female 90º to pump in
(1) Button Head Hex Drive Screw 18-8 Stainless M8 x 1.25 Thread Size, 15mm Long (bracket to chassis)
(1) Nylon lock nut – M8 x 1.25 mm Thread, 9.5 mm High (bracket to chassis)
(1) Button Head Hex Drive Screw Passivated 18-8 Stainless Steel, M10 x 1.50 mm Thread, 16mm Long (bracket to chassis)

JB4, BMS intake, BMS charge pipe, BMS WMI, ~93 octane, factory flash