So I've had the Ark Grip exhaust for about 8 months now, and I've loved it the whole time! A little bit of drone like what others say, but nothing as bad as any other previous cars or exhaust systems I've had.
Yesterday I got to put on my SSR downpipes, and o man it just gets better! All things held equal, the downpipes make it the slightest bit louder (for example, driving in sport mode under normal acceleration, you hear the exhaust more now), but the drone is almost completely gone. Also in comfort if you keep your foot light around town it's actually more peaceful in the cabin.
I only went on the highway for a little bit to see what it was like, but the difference is almost not noticeable. Cruising from 65 to 80 is the same loudness but minus the drone. If you try to accelerate at highway speeds it is a little louder though, and some drone exists above 75 trying to accelerate or stay at speed going up hill. But overall I like it a lot more now.