Magnaflow muffler ....

My brother has magnaflows on his 67 408 barracuda and it sound good at low rpms and sounds like a stock car at higher rpms.
I have 2 1/2 flowmaster 40 series on my 413 duster and it sounds awesome! I've never experienced this crazy drone everyone talks about? I don't know maybe i like my car to sound like a muscle car....