Someone is selling a 3 month-used Tubi Muffler for the GranTurismo. He had to take it off because it was TOO loud. The stock muffler sound is a bit too quiet on regular mode, but is a bit louder on sport mode. I would like to upgrade the roar a bit more, but not too much to the point it gets obnoxious. For those with Tubi mufflers, how much of an increase in sound should I expect? Loud enough or REALLY loud?