get a turbo that's NOT internally wastgated... then use an aftermarket external... they're MUCH more precise.. and you can buy different springs to change how much it allows the turbo to spool... Oh and they are adjustable +/- a couple of pounds with a simple twist of the top of it.. (some maybe not all)...
I know that the porsche 944's were not internally wastegated...
probobly more...
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