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With the mods you listed, I will go out on a limb and say you never had 412 RWHP to begin with.
Perhaps the shop doing your mods and 1st dyno run made it "look good" for you.
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1996 Corvette - LT4
2017 Camaro 2SS
2019 GMC Sierra 2500 HD
2015 Harley Davidson Ultra Limited
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