The current 5er is pretty quiet; too quiet for some purists. A certain amount of road noise is caused by run-flat tires, and a quieter ride can be had by replacing these with non-RFTs. Taller, narrower tires are better for noise, too -- but not for handling, except maybe in snow. As for engine sound, the sad fact is that a turbocharged motor is never going to have the pleasing mechanical and exhaust sound of the old naturally aspirated sixes. And they're gone, except for what's left of the current E92 - E93 production.
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