Quote:
Originally Posted by Kponti
Not sure you understood my question so let me rephrase.
Is your 2021 M5c faster after you installed the JB4 or did it stay about the same?
BTW 10.9 stock is pretty fast!
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Same I don’t see diferent i try map 1, 2 and 3 but i keep you update when i get back to the track after i resolve the ck engine problem
