Boost Cooler Stage2 MK5 FSI

The Stage2 FSI water/methanol injection system (for Mk5 FSI VW/Audi) includes all the basic parts needed to start making big HP! A full 80% of our customers choose this kit.

Expect 50degF+ drops in intake temperature and octane boost to over 110. (Non-intercooled engines will typically enjoy even greater reductions in air temperatures.) Includes: MAF-based load-referencing controller that varies the quantity injected vs. air flow for the smoothest power curve possible. Also equipped with 220 psi high volume pump, 3qt reservoir, two spray nozzles, Bosch relay, all electrical parts, fittings, tubing etc. to install a complete kit.

Late model direct-injected engines use frequency-modulated MAF sensors (vs. the standard analog 0-5V type). This controller is specifically configured to work with FSI engines (of all displacements and cylinder counts). Proper setup ensures superior power output, increased safety margin, reduced stress, and much-improved driveability. The engine load-referencing controller is truly the "special sauce" of a modern water/methanol injection system.

Nozzles MUST be sized properly to match total fuel flow, 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.