nice end results but you are saying that the Mustang reads 12% lower... which would put you at 346hp at the wheels, stock.. that did NOT happen.
also, was the 'stock' dyno run with the downpipe installed or was that tested on a different day? if so, the comparison is a bit skewed due to different run conditions.
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2019 G30 M550i
GBNF:
2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
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