i will contend that the greatest sounding cars in the history of motor racing were can am cars. if you would like to debate me about this, then you have never witnessed them in person!
I had posted these videos about a year and half ago—but just saw them again today and had to repost them.
race footage from 1967 Road America.
IEDEI 
You contention is 100% right. Can Am cars are simply spine-tingling to hear in person. Especially at Road America.