Interesting....I actually have found that the droning is usually lessened by cars running 3.73's and above. It seems to put them past that magical 1800-2000rpm point at highway speeds where the noise is really bad. But you have to admit they do drone a fair amount, in comparison to stock, or the 50-series mufflers. If it takes the sound of a blaring radio and your windows down with the wind rushing past you at 65mph for it to be "hardly noticeable", then it's say it's still very noticeable. I admit, the swap from the stock H-pipe to my O/R Bassani helped a little, but it's still there and annoying on those days you're tired and coming home from work or you just want a nice mellow cruise.
But, most people still go for the 40's anyway, because a they think louder is just plain better. Hell, that's what I thought when I bought my Mac system. But I guess I'm just getting old and sick of everyone thinking I'm trying to race them when I’m beside them. They're mistaking the sound of my normally loud exhaust for me actually attempting to "get on it", all of the time. I personally prefer it quiet but “throaty” sound of the 50’s at cruise and to sound like I’m “getting on it”, when I actually am.