The R8’s 5.2-liter V10 (borrowed from Lamborghini) offered a high-pitched, metallic shriek at 8,700 RPM. Meanwhile, the RS6’s 4.0-liter twin-turbo V8 produced a deeper, bass-heavy boom, punctuated by artificial "farts" from the exhaust valves during gear changes. These were not just sounds; they were status signals.
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