B5 S4 (2.7TT) Throttle Body Flange

These flanges are the same as are included in the dual nozzle mount packages. Intended to mount a water/meth injection nozzle for detonation suppression, the flange also adds plenum volume (good for boosting midrange torque).

Audi B5 S4 throttle spacer (water/methanol) Audi S4 2.8 V6 throttle spacer (water/alcohol)

Kit includes flange, 2x OEM gaskets, and extra-long bolts.

Audi B5 S4 throttle spacer plate for WMI

Nozzle sizing advice:
Flow rates MUST be dialed in to match total fuel requirement, boost levels, and intercooling setup. Please contact USRT for help with this critical aspect of kit configuration. Other companies randomly provide nozzles that they have in stock with the lazy and false assumption that "one size fits all" applications. They abandon the user to to determine final setup on their own via trial and error. Dyno time is expensive and so are engine internals. Consult with our tech support to get it right from the very beginning.

Audi B5 S4 throttle spacer for WMI octane Audi B5 S4 spacer for water/meth injection Audi B5 S4 throttle spacer (1/8 NPT port)



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  • Model: FLANGEWAIB5S4
  • Manufactured by: US Rally Team

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