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I'll report in, if only to show that sound observed is not a one size fits all solution.
Eventuri intake, European BMW CSL (OEM) headers, Stromung cat back. I can still hear the intake when it really comes on in higher RPM, otherwise the exhaust noise can be overpowering. According to the wife the car is much louder inside than out.
I had the Eventuri and Stromung on for ~2 years prior to the CSL addition. Much quieter, tons of intake noise. Eventually I will replace the Eventuri with a a CSL airbox and potentially return to stock mufflers.
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