Unfortunately I don't have a Nissan Z car handy for comparison purposes. You'll need to describe the noise in more detail

Whistling sound? Sound like a 'fartcan' exhaust tip on a Honda? Burbling sound? Rumbling sound? High-pitched sound?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22