I don't have it handy but there is a thread or two already on here about injecting pre-turbo. Past experiences with poorly atomizing systems and possibly weaker materials have not been good on the compressor. I have never been convinced any potential gains from pre-turbo spraying are worth it and think you will find that spraying somewhere in the system along your intercooler to throttle body piping will work well. Possibly right at the intercooler exit to give some travel distance for mixing prior to your throttle body since it is at one end of the plenum.
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