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BM3 is working on the tune for the Z4 M40i currently with the beta on the m340i. They use the same engine whereas the Supra uses a slightly older variant of the B58. I have my BM3 license and registered it to the car, just waiting for a release now.
With that being said, I don’t see them having the B46/48 tunes out yet for this car. You’d have to ask them though since I don’t believe they are a relatively new variant. BM3 does support our Firmware currently so it can read everything off the car and match any available tunes.
As far as M Performance parts, they already announced there won’t be an LCI for the G29 and production will end in 2024 (correct me if I’m wrong) if memory serves me correctly. The car wasn’t expected to be a huge seller so they didn’t R&D the parts ahead of time and doubt they will at all. Best bet is aftermarket like 3D Design, AC Schnitzer, and more European companies as the car has more support over there.
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