I picked up my '19 SCREW last week...approaching 500 miles!
I stomped on it right after leaving the dealer and it got really loud, too loud for my taste. The last thing I'll be doing is removing any resonators, if anything I'd be searching for better sounding mufflers. The system is already free flowing as far as I see. Any exhaust mod will be less restrictive down pipes and Cats + quiet mufflers.
I'm a fox body 5.0 man, got my first one January 1988 and still have a 1988 ASC Maclaren. That era's 2 chambered Flowmaster's with catless 2 1/2" pipes was my choice and I regretted it on the highways, but loved it rowing through the gears. After that I went with Walker Dynomax Turbo mufflers on both turbo and supercharged mustangs.
JM2C!