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if you look at the parts, you would think it would be simpe to make, just where to get a water pump with that kind of preassure 150 to 180 psi. and how will it adjust it self like the snow performance one,
Stage 1 Diesel Boost Cooler™
This kit progressively injects more or less water-methanol, according to manifold boost pressure. The system is applicable for turbo diesels making up to 25psi of boost pressure. It has two dials to set the start and full points to tailor the delivery to your engines needs. Progressively injecting according to boost pressure allows for the most power over the widest range of rpms.
You can go to a farm store and get a big spraying tank, or I think they sell a 8 gal tank too. I have a 8 gal tank in the tool box and its good for about 400 miles...