My only thoughts on flash tuning other than posted above, is go into it thoughtfully. I’ve been custom tuning LS turbo engines since 2001. One common theme I have seen over the years is your tune is only as good as your tuner. There are a ton of LS turbo tuners around. I know less than 5 that I would let touch the ECM on my LS. A lot of folks think they can tune and I have scanned a lot of junk tunes.
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