These flanges are the same as are included in the dual nozzle mount packages. Shared with VR6 OBD2 examples, the center hole measures 2.735”. Intended to mount a water/meth injection nozzle for detonation suppression, the flange also adds plenum volume (good for boosting midrange torque).
Kit includes flange, 2x OEM gaskets, and extra-long bolts.
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.