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      08-20-2021, 03:35 PM   #104
DrivenAgain
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Drives: 2018 BMW M5
Join Date: Dec 2020
Location: MD

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Quote:
Originally Posted by pbonsalb View Post
Certainly buying catless uppers and leaving stock secondaries is the cheapest way to improve flow. Stock secondaries flow a few percent more than stock primaries, but having only 1 instead of 2 helps.
Do you run this setup? I assume it will trip a CEL.
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