Best methanol injection out there??

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I'm thinking long and hard about adding a methanol injection kit to my car and leaning it out a good bit in an attempt to improve my gas mileage. Can anybody recommend a couple good kits to check out and compare?

AND NO I DO NOT WANT TO HEAR ABOUT HHO SYSTEMS OR MAGIC SUPEREFFICIENCY CRAP. WORKS, DOESN'T WORK, I DON'T CARE. THIS THREAD IS ABOUT METHANOL INJECTION.