Added a Borla ProXS muffler to my existing Rev9 + vibrant resonator setup.
That ended up being what it took to give me a good stage 2 freeway experience. There was a lot of boominess (called "drone" by some) in the usual 2500 - 3500 under load rpm range. New muffler has calmed it right down. Along with $150 worth of cabin sound insulation, its very nice and mellow in there. I hardly notice exhaust noise at all now, except *after* 4000 rpm when I move into the "drive like an asshole" mode.
That ended up being what it took to give me a good stage 2 freeway experience. There was a lot of boominess (called "drone" by some) in the usual 2500 - 3500 under load rpm range. New muffler has calmed it right down. Along with $150 worth of cabin sound insulation, its very nice and mellow in there. I hardly notice exhaust noise at all now, except *after* 4000 rpm when I move into the "drive like an asshole" mode.