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I'd be very curious to learn what the CPI of the stock CAT is. I think 200 cpi might be the sweet spot to see gains and have some cost justification for a catted downpipe. Of course then we have to worry about setting off a light because the O2 sensor is seeing something is doesn't expect too (yes, even catted DP's have the risk of setting off the light).
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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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