How critical are down pipes?
I am running a JB4 with map 5 30% e85 70% 91 car has a muffler delete but is stock otherwise I plan on ordering a intercooler before summer
I am torn on down pipes I have to get emissions test every two years and the DP fix seems like a pain since it is not recommended to be left installed. I also don't want the car to smell although the mid cats should clean it up enough.
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2017 M3 Alpine White 6MT
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