I have owned a magnaflow system twice now. The first one was...
Weapon R header (2.0" collector)
Magnaflow high-flow cat (2.5" in and 2.5" out)
Magnaflow aluminum resonator (18" length of the muffler section and 4 inches around)
Magnaflow aluminum 6 inch round body muffler (with 4" tip)
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Lots of highway and steady RPM droning. Pretty annoying and is corroded to all hell, broke apart and took a dump. This was after 5 years of daily use and PA salty winter roads.
The new system is currently...
DNA Motoring header (2.5" collector)
Magnaflow high-flow cat (2.5" in and 2.5" out)
Magnaflow Stainless Steel resonator (22" length of the muffler section, 28" overall length and 4 inches around)
Magnaflow Stainless Steel 5" by 9" oval body muffler (with 2.5" tip)
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So far, no highway droning. The only thing changed was resonator and muffler. The brand was the same. Relating brands to droning is a false idea. Most people think droning is brand relative when the parts chosen are the real problem.