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Injecting methanol into your engine is very effective, and we've covered the topic several times in MM&FF. There are, however, those who are always fearful of using it for one reason or another. Snow Performance, one of the leading meth-injection companies, has a solution to help ease your mind. The Safe Injection Pro (SI-Pro) ties into your ECU and triggers the timing once the meth is flowing. There is also an input to read 0-5 volts (based on meth flow) for tuners who add timing in stages; as the flow increases, so does the timing.