the flowmaster 40/44 series has to be the worst sounding muffler ever made. very cliche' and it seems like everyone with a 302 powered, Fox body Mustang or 80s/90s Camaro, would run them. that don't necessarily make them "cool".
The Fox Rustangs are the only thing I really like Flowmasters on. But it has to be a mostly stock Rustang and the right Flowmaster. Other than that I think they suck.