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      10-09-2019, 05:04 PM   #28
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Drives: 2020 Z4 M40i
Join Date: Sep 2019
Location: Lake Forest, CA

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Originally Posted by upsidedownfunnel View Post
No, they're just different versions of the B58. The Euro M340i uses a version of the engine that is almost the same as the American M340i and American Z4 M40i. The Euro M340i makes about 375hp which is a direct result of the GPF required for European cars.

The B58 version in the Euro Z4 M40i and Supra are just different. I think it's mostly due to tuning, but there are some B58 versions with different parts. For instance, the earlier 320hp versions of the motor did not have the head-integrated exhaust manifold that more modern versions do.
Yea I never understood why Euro Z4 M40 was underpowered when the new M340i did not have the same problem with GPF. There might be commercial reasons.