“The record for the fastest single-engined piston plane is held by a modified Grumman F8F Bearcat, the Rare Bear, with a speed of 850.24 km/h (528.31 mph) on 21 August 1989 at Las Vegas, Nevada, United States of America.”[8][9]
I’ve seen Rare Bear fly at Reno. You don’t so much hear it as you do feel it.