As someone who also has the MPPSK and is looking at going catless, I've asked around the forum and opinions on the effects have been inconsistent. Some have loved and say they love the sound, other say it's too aggressive and the noise is not at all enjoyable. Watching videos doesn't really help since its not the true sound you'll be getting.
I might end up just going high flow cat.
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2016 340i / M-Sport / Track Handling Package / MPPSK / AA DP / CTS Intake / Bootmod3 e30
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