Quote:
Originally Posted by Principe
Nop to give you a example i ran 10.8 with the M5 2018 1st edition JB4 exhaust downpipe filters and i ran 10.9 M5 2021 Competition Stock
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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!