interesting thread..amazing the amount of knowledge that is out there , fascinating reading. About the greatest sounding piston engined fighter..i guess its about taste, but for me it has to be the rolls royce merlin (or packard merlin) as fitted to most of the mustangs. This sound of this work of art just brings me out in goosebumps! Try
www.warbirdobsession.com for a comparison of a few.
cheers Pat