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Can you share any info on why you think the GM design is what it is? These folks aren't idiots and have been designing similar TBs for decades now. I'd guess a lot of it comes down to emissions and fuel economy rather than outright performance?
As far as not tuning for the new TB, it seems like there will be more air than the system expects, does the MAF and/or MAP sensor compensate with no problem? Would a tune be able to improve the results?
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