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Yes, it would cause compressor surge. Off-throttle compressor surge isn't going to hurt a 18G in any way.
Your dyno show the Ptuning hitting full spool on low boost at about 4000 rpm. That's a lot more than a few hundred behind 2300.
You should do an apples to apples comparison, both boost pressure, fuel, and breathing mods. I hit 250whp on ACN91 with a stock front pipe and stock catback at just 5.5 psi, for example. I hit 360whp at 10.5psi on the same setup with ethanol. Dead silent.
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