I have a fswerks race exhaust on my focus and it has drone big time, but it sounds fantastic. They make a stealth version that has a resonator. The fswerks exhaust on the ST I can't hear/ feel any drone. I'm sure it's there it's just not noticeable to me, but I don't have your knowledge of sound frequencies.
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I have abnormally acute hearing so I’ve always been really interested in sound/noise control. I can hear most ac power adapters and can usually tell when one is going bad (an unstable squeal sound). It’s neat because I can isolate “abnormal” sounds, but it’s aggravating because I can’t “turn it off”, so I tend to wear earplugs very often, even if it’s just noise filters to tone things down by a few dB. When it comes to car exhaust, for example, the “moo” of the mbrp- it’s deafening to me, so I have a keen interest in curing it. All my learning and research has led to some really nifty sounding exhaust systems over the years, like one recently straight piped Ti exhaust for a friends RS5 that doesn’t drone inside at all. 3 different quarter wave resonators on that car, no mufflers, no drone
(very expensive!) he got all the ti straight pipe done then couldn’t drive the car (painful inside), after the quarter waves you almost can’t tell he had exhaust until he hits the throttle
loooots of room for exhaust under that car with the mufflers gone lol. I wish there was that much room under the FiST! My quarter wave tubes on the FiST have to coil up like a snake to fit.