Flowmaster American Thunder

hey all, im looking for an exhaust system for my 66 mustang. i was wondering whether anybody with a classic has Flowmasters cus ive been told they dont sound good on old cars. does anybody know what sounds the best on old stangs? i like deep, growling tones :D thanks in advance
 
flowmasters were made for classic cars

i have a 68 coupe i have the 40's series flowmasters , let me tell you they are loud as f u c k. they sound great, i have 2 1/2 in tubing.
well worth it.flomasters were made for classic cars . i live in santa rosa ca were the invented the flowmasters.