yea i have 3" dynomax super turbos on my dart and they are nice and quiet. but they are huge cases. have two other friends running the dynomax mufflers too. they are both quite a bit louder them mine. they are smaller case 2 1/2 i believe. the set on the 440 challenger with stock manifolds drone like mad.. hell the drone drives me nuts when i'm following him its so bad..lol.. the other 360 with full length headers i don't think does it but i'm not 100% sure..
i took the mustang to the shore the other night and at a little over 80mph i could hear where it would have a drone.. guess it had a slight drone but it wasn't one that would bother me.. my car has one stock ford muffler and one replacement muffler.
i had a 90 mustang rag top years ago that i put flowmasters on.. all stock other then that. it was great witht he 2.73 gear in it.. no drone and they were really quiet.. then i put a 3.73 gear int he car and man did the drone get annoying... it was horrible on the highway..
my biggest fear is spending the money on the mufflers and not being happy with them.. really don't want to spend money on mufflers 4 times just to get it right...lol. wish someone repopped the stock ones because i would just stick them on..
i'm not planning any major work to the car.. don't really want to do headers or anything.. may put gear in it but thats probably it.. its more a family cruiser...
I now get into allot of trouble because everybody and their mom tries to mess with me because the car is stock sounding and they assume it stock until I pass them and let the blowoff valve release as I pass their window.