In my opinion, and according my experience at trackside :
F550 Maranello
Aston DBR9 (same period than 550)
Both are very smooth
Of course, whole the Corvettes (except the c8)
At Le Mans Classic I heard the Peugeot 905 and others Group C, I loved them
More recently, I like the sound of the Gibson, even if it is veryyy common those last years…
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