1970 Chevrolet Chevelle SS 454 exhaust rumble

My friend's car that he owned around 18 years and put in 14 engines over the years. That day we were going to bring it to a Garage that he sold it to. We went to many car shows and meets together so it was a sad day.
40 series Flowmasters with one blown up on the inside and headers are Hooker Competition stainless long tubes.