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      10-14-2019, 04:42 AM   #4
M 4 FUN
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Drives: BMW 320, BMW M4 competiti
Join Date: Aug 2016
Location: Sweden

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I would say it depends on tune and warranty. If you're going stock or maybe Bootmod3 stage1 or 2 there is no need to do anything. Personally i feel that the MPE is more than loud enough as it is. Louder isn't always better.