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There are lots of options for tunes and FMIC upgrades. The trick is that it's the engine you care about, not the car model. Z4s are relatively rare and there's not a lot specifically for the Z4. But the N20 engine in your Z4 is the same as in the 328i and there are thousands of them that have been modded. Search for "BMW N20 tune" and "BMW N20 FMIC".
Both Dinan and Burger Motorsports offer inline tuners. ARM and VRSF both offer FMIC options.
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2023 Z4 ///M40i Thundernight Metallic/Cognac Vernasca/Moonlight/Shadowline/19" Black 799M/PP/DAP/ACC/HK
2022 X5 xDrive40i Phytonic Blue/Cognac Vernasca/DAPP/LSP/PP/CCP/PAP/20" Style 738/Spare Tire/Trailer Hitch
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