It's seems that despite blaming the hp difference on the GPF, it doesn't "cost" that much hp in other BMW applications?? There are significant hardware differences between the Z4's B58B30O1 and the Supra's B58B30M1 - heads, pistons, conrods, manifolds, turbos, etc.
https://g29.bimmerpost.com/forums/sh...1621271&page=3