http://en.wikipedia.org/wiki/Helmholtz_resonancethis is basically the phenomemon happening with drone you can add in some pipes off the main exhaust to help cancel the drone, too...Solo Performance does this on a lot of their cat back systems check out http://solo-performance.com/ for an example
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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