I might do the same as this sounds like the sound I am going for. Quiet as possible with valves closed (like oem quiet, even if it means increased backpressure/loss of performance) and high-pitched "exotic" sound when open.
I'm sticking with stock cats so needs to hook up to oem x.
Thank you for the tip!
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-Thumbie
2011 Jerez E90 M3 6-speed Competition Package
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