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Yes--the Unitronic ECU Stage 1 and 1+ ECU tunes are now available for 2023 model S8. I had mine done locally here in NE Florida (1+ since we have good 'ol 93 octane). Very noticeable difference at 40mph and higher, slight difference from a stop until hitting that 40mph zone. The TCU tune is not yet available. And yes, you can get their cable to remove the flash yourself if you need to for the reasons you might dream about...