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69 Charger General Lee exhaust with Flowmaster 50 suv mufflers and 14" Magnaflow 4" dia. resonators upstream of the FM's cut down the resonance to nearly ZERO! A small mellowing of the external exhaust note is detectable, but the big difference is inside! Internal resonance is nearly completely gone throughout the rpm range... So much nicer to drive now, no more itchy brain and no headache from long freeway drives. This combo is still a non restrictive setup without the FM's chambered resonating racket, almost sounds "Borla" like in tone. This came from Modern Muffler in Sunnyvale Ca, the propriator Steve Parker took fantastic care of me and put this amazing system together for my demanding taste in car audio! I highly recomend him for any and all exhaust work - 408-243-2388