Cross post from B8/8.5 S4 Classifieds

Selling a water-methanol injection kit that I pieced together specifically for a B8/8.5 S4 but can work for multiple applications. I recently removed it from my B8.5 S4 before selling it.
Price: $300 before shipping, firm on price, shipping will be buyer's expense
Location: Baltimore, MD

The goal was to limit how many times I would have to fill the tank and make it easily accessible for whenever I had to fill it.

What you'll get:

  • ProMeth PM75
  • ProMeth Check Valve
  • ProMeth 4AN Steel Braided Hose - two sections - 18ft & 4ft
  • Boost Hose - 18ft
  • Burger Motorsports 2 Gallon Universal Low Profile Water/Methanol Injection (WMI) Tank
  • Burger Motorsports Billet Tank Cap with Safety Check Valve
  • AEM 30-3304 w/Harness - The boost nipple is damaged but it held fine with a thin zip tie
  • ProMeth Nozzle 1260 CC
  • ProMeth Nozzle 1000 CC
  • ProMeth Nozzle 504 CC
  • Add-A-Fuse w/one 5A fuse
  • C-clamps for tank


What you'll need:
  • Boost tap
  • Patience


My installation method:
Controller
Placed in the rear driver-side cavity in the trunk and zip tied to the empty shelf. Great routing point for the harness to go towards the driver-side fuse panel if you want to tap for power there as well as all the wires that have to go towards the pump.

Tank
Removed the spare tire and fit perfectly between the battery and the wall. I moved some sensor that's in there to the left; I think I remember it being mounted to the floor or more near the center. I used a piece of rubber (purple in the pictures) to help provide a little lift towards the pump's inlet. I used the small c-clamps to clamp the corners nearest the battery as well as the holes that are already in the floor.

Lines
The boost line starts AEM controller and the 18ft segment of the steel-braided line starts at the pump/tank within the spare tire cavity. They meet at a grommet that comes out of the spare tire cavity and go towards the passenger-side exhaust. I used the exhaust heat shield to sandwich the lines against the body, ran it against the frame by the rear passenger-side strut, then had it follow the fuel lines all the way to a grommet that leads to the firewall cowl. I used the factory hole in the cowl wall to run the 4ft segment of hose wrapped in a protective sleeve to protect the opening from the hose's movement if there was ever any. I also added a bit of shrink wrap on the opening to help strengthen the opening (can be seen covering the VIN in the pictures).

Pictures: Full resolution in my Lightroom: https://adobe.ly/4dfKit2

Pictures won't upload on the website for me at this time.