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The wiki and other sites really don't break it down... All I've read is the S58 upper end (intake, valves, turbo) is totally different from the B58 as well as the exhaust. Would love a precise breakdown including timing and valve lift details, lol. But even if you could get the parts and do a top/swap, not sure you'd get support, you'd be on your own (tuning, dialing it in).
A better question would be to define the differences between the B58B30M0 (M240i) and the B58B3C (Supra)... BM3 tunes show a significant difference in HP between the two, with same mechanical mods, 40HP difference... Is significant enough that typically cannot be achieved without some physical/mechanical changes. There probably is some "down tuning" going on, in the name of safe tuning, lol. Just a guess until identifying some engine differences. I think the Supra modding groups will bleed information over to the M240 as it is the same engine but a more active group currently.
Regards
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