I wish I knew what my cars sound like from the back. They sound great from the driver's seat, though. I have not let others drive my cars.

 

+1 PSE burble. Nothing like the Arrow pipes on my Ducati tho.

 

PSE burble rules! My neighbor recently said that it sounds great as I round the corner and decel while approaching my driveway... and that people's heads turn like prairie dogs when I drive by.
That being said, it's hard to beat an LS1 Corvette's burble.

 

This is just wrong....Babble On!!!