Any ducati V- twin thru a pair of conti's 1971-1984 stock standard, and the old triumph stags used to have such a nice burble.....again factory stock.

Is your favourite in here Dinsdale? Never flown in a DC3 but I did live close to the flight path of Essendon airport in the 60s, so I've probably heard more DC3 fly overs than most. A mate used to live right under the flight path in Airport West. They had a picture on the wall which used to oscillate as the planes went over head. When they took the picture down it had worn an arc into the gyprock.

I also worked with an old timer, he'd flown in New Guinea, who used to say " Look at this head " , it was a pretty rough head, "Been thru the windscreen of a DC3 three times". He also claimed to have looped a DC3, not sure if he was pulling my leg. Dinsdale?

May have worked it out or not will see.
So smooth, resposive & the revs mmmm.