Flowmaster 50series question

When I bought my 64 A100 (273) it has 2.5" pipes and flowmaster 50 series muffler and turndowns in front of the axle.
It is louder that what I would like (inside and out) . If I add tail pipes all the way to the back ,will that quiet things down much? or should I get a pair of turbo mufflers and tail pipes. I don't want an exhaust system that is unbearable to drive for several hours at a time. I guess I'm getting old. Loud is not as much fun ,as when I was younger and dumber.