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Hmm, wow, you definitely have a big problem. I saw the same type of power drop on my car when I first added alky and cranked the boost to 26psi. My spark was blowing out, and I would drop 50whp immediately and run like crap to 7k rpm. I just had to go with one step colder plugs.
That could also indicate a major timing pull, but it would have to be some mega-detonation, which shouldn't be happening with a Dynoflash tune unless there is something broken somewhere.
I don't know what other BOVs will directly fit that flange - wish I did. Yes, altitude will make a difference. You really need to be tuned at 1000', not 6000'.
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11.51@117.72 - PMI
11.62@116.60 - Bandi
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