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i've had dynomax super turbos on my 68 mustang fo the past 6 1/2 years and they are great....they are quiet like a regular muffler. but if you open the car up a bit, they get loud...the flowmasters i had on my bronco were always louder than the dynomax, and at WOT were just obnoxiously loud

i'll go back with dynomax on it and on my barracuda when it's exhaust time

unless i decide to try afterburners by flowtech....but i know nothing of them