I removed mine when I put a Pypes Street Pro Impala system on my RMW, with the exhaust exiting just after the rear wheels. It was too loud imo, and I ended up mating the stock tail pipes (w/resonators) to the Pypes ota pipes. It's still pretty loud, but not obnoxious, and I like it much better. It's not an apples to apples comparison though, as I added the full tail pipes too, and that will make a difference in sound as well.
Pro's- louder
Con's- louder
Mike