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While I’ve never tuned a bmw myself, all the domestic platforms in the last 15 years I have tuned, have tables for throttle body air flow characteristics, and when changing throttle bodies, they pretty much always require tuning to compensate. As others have said, you’re changing a “known” measurement in a fixed environment, and allowing more air to pass through. In addition, has anyone actually proven the factory throttle body to be a restriction at all? The same thing has happened for decades where many feel “bigger is better” on cylinder heads, mass air meters, etc, and found that velocity and airflow properties are significantly changed, often for the negative, unless other properties are changed as well to work with the different parts (see “Bernoulli’s principal”).
I’m not saying it won’t work, I’m just saying with many other auto platforms, it doesn’t, and tuning is required to make it function properly, generally with minimal gains after all that work.
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