I am running flowtech afterburner mufflers and love the sound of them..They have a nice rumble at idle and sound great when you get on the gas..They are decently quiet when your just cruising though...I would recommend 2 1/4 inch exhaust with tailpipes exiting somewhere behind the back wheels...If your going to headers just for "the sound" I wouldn't bother...I do recommend them for performance though..

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1968 mustang..408 windsor.Vic jr heads and intake.Pro Systems 950HP holley, 1 3/4 hooker super comps,Custom CI solid roller camshaft,Probe shaft rockers, 4 speed with 4:11 detroit locker.