I knew a guy in College who had the two flowmasters underneath...50 series...and then they came UP over the rear diff and into the trunk area and he installed two more Flowmasters in there behind each wheel well and then sent the exhaust down through a 90º bend and out of the rear quarters...

Strangest thing I had ever seen for exhaust routing. I dunno why he did all that...Car was a sleeper but annoying as heck if you were a passenger.

Car was a 66 Chevy Malibu or something