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.

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. 
• Pump mounts directly to the tank 
• Includes 2-way vented black plastic cap
• Optional upgraded blue billet lid with 1-way check valve
• Includes all mounting hardware

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

Vehicle Fitment

BMW M3
• 2021-Present S58 G80 BMW M3
• 2021-Present S58 G80 BMW M3 Competition

BMW M4
• 2021-Present S58 G82 BMW M4 (requires cutting of trunk liner)
• 2021-Present S58 G82 BMW M4 Competition (requires cutting of trunk liner)

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

BMW 4 Series
• 2021-Present G22 BMW M440i including xDrive (requires cutting of trunk liner)

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)