If there is an Osiris tuner in your area, it's always best to have it directly tuned on a dyno. If there is no other option, then the e-tune route works, but may take 2-3 attempts to get it perfect. This takes time, as you need to send out a datalog, wait for the changes to be made, upload the new tune, and datalog again to see if the changes helped or not. If not, guess what; you're doing the whole process over until you get it right.
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