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I would not put it at 10% louder but more of 50%. In basement carpark this will be further amplified with awesomeness.
Brand new MPE will be quieter. As you put on more miles, the MPE gets louder.
At 60mph with no engine load, it's just marginally louder than Stock.
The sweet spot for MPE is between 3900-4900rpm when under engine load. Anything above is just pure induction/engine noise.
So far I have not experienced any drone. I used to have a custom exhaust which droned about 2k. The MPE is perfect. Loud when you want it, Quiet when cruising.
No way will the M3 sound like a Ferrari (assuming F430/458). Ferrari uses flat plane crank compared to our crossplane S65. The firing order is also different.
The exhaust gases travel a much shorter distance compared to M3.
The MPE gives an exotic sound at 3900-4900rpm. This is something I have not heard when I used my Custom Exhaust and other reputable brands. All of which does not give an exotic sound in that RPM range. You'll have to hear it for yourself to understand what I mean.
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