by design nature mercedes benz exhausts are usually straight through or with maximum flowing charecteristics. e.g. when I go full throttle on my E320 its exhaust tips actually produce a sound like a factory exhaust on a 4 cylinder motorcycle. - Usually noticed in very quiet surroundings.

The sudden volume increase is more noticed in diesel vehicles as their old exhausts are loaded quite heavy with soot accumulation.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)