Significant power boost.
Yes, it will cause a CEL and the smell of fumes will be considerably more noticeable.
You're hurting the environment and it's illegal to alter your emissions equipment.
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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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