The flow masters are known for the drone....I'm a poet, lol! Anyway, the 50 series mufflers are said not to have a drone, but I can't say for sure as I have the 40 series and yeah, they drone at lower rpm's.
I have the American Thunder Flowmaster tubing with a H-Pipe, header back 3" mandrel bent system, purchased from Summit racing 2007 or so, but with older 50 series/Delta flow race mufflers {I purchase a few sets years ago} on my 68 RR 479ci-6bbl with tail-pipes out the rear {I also have one, a 3" cat-back on my 99 Dakota 4x4 5.2ltr. too}, it's kind of loud on the RR {not so much on the Dakota} but the RR has 600+hp the Dakota has 300hp & is allot higher off the ground, but no real bad drone, in either vehicle, like others seem to experience & it kind of gets quitter as you accelerate, to a point....
Music to my ears.... Isn't a 60's "muscle car" supposed to be a "little obnoxious anyway", isn't that the whole point of owning these "old Muscle cars"... IMHFO it's the whole combo not just the mufflers or just the tubing, headers, camshaft, valve train, convert stall, if it's rubber mounted or not, maybe even where it's mounted to the car or how low the cars is to the ground, etc. etc. etc. all these type things, will also effect the sound coming from your perceived cars mufflers &/or exhaust inside the car... But some good quality sound deadening does/will help too &
especially between the trunk under & behind the back seat &/or package tray &/or under the carpeting... Many people that had drone issues also had header noise, from 18-20ga. thin wall tubing, even rubbing or exhaust tubing rubbing or solid mounted, somewhere adding to the drone noise... Hell my electric fuel pump is far more obnoxious than my exhaust ever is/was...
If I want "quite" I will drive something else, neither are anywhere nears as obnoxious as the 7.3ltr. Powerstroke diesel drone going down the HWY or idling...
Another big part of the problem is the big *** trunk on these B-Bodies is like a big base drum/megaphone for noise too... a matt in the trunk will probably help also, or add some insulation too, maybe... If you like the exhaust tone anyway...
