Questions on the Supra vs. the Z4 M40i specifically the B58 engine

Z4UPRA

Do we have any official explanation from Toyota or any knowledgeable sources on why they detuned the engine for the Supra vs Z4?

Here are the specs for reference:

Z4 has 382 hp between 5,000 and 6,500 rpm, plus 369 lb-ft. of peak torque from 1,600 to 4,500 rpm. 0 to 60-3.9 seconds. It bests the Supra’s 4.1-second time, which makes sense since it has 47 extra horsepower and only weighs 46 extra pounds.

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I know 3.9 vs 4.1 is not something anyone can feel in real world driving but under <4.0 s official does give you bragging rights. Although I do recognize that the Supra is a better deal per $ when you can get only the 4 cylinder Z4 for $50K.

Was it cost? reliability concerns? fuel efficiency? holding back for a more powerful version in the future (read:more profit)?

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