i use the pypes race pros with their full 3" x-pipe system & tail pipes & they have very little drone, & what is there is only at a certain rpm well above what a cruise rpm should be with overdrive. i have 3.23 gears & at 65mph im doing about 2600-2700 rpm, the drone happens around 2500 but is not bad at all compared to some ive heard.
one friend has flowmaster 40s on a 462 9.5:1 pontiac with a "mild" cam & 2.5 pipes with an h pipe & full tails, it has very bad drone from about 1800-2500. another friend has ultraflos on a 3" system with no crossover & no tailpipes, its a 600hp 13:1 406 sbc & it has terrible drone from right off idle untill at least 3000, but it runs low 10's on the motor & mid 9's on nitrous... can barely hear yourself yelling in that thing! i used to run 2.5" super turbo knock offs on a mild cam 9:1 455, headers & shop bent pipes with no crossover or tails & it had very bad drone too.
how much drone any given car has depends on many other things like the header size, pipe size, x or h crossovers, location of the mufflers in the system & if you have full tail pipes. so dont dismiss pypes mufflers based on a few bad reviews, many other people like them.
best of luck picking a muffler you like but remember, what one guy likes on his car, another guy will hate on their car... & what one guy considers loud/drone, another guy will consider nice & quiet. it all comes down to personal opinion.
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