I'm sorry, more to this story. I have owned all kinds of exhausts; the 2.5" thermal on my 2025 is quiet unless you are getting on it. It doesn't do shit at hwy speeds.
BTW, you never answered the question. Did your brother have a 2.5" or a 3.0"...
I am not debating the SW drones, I dont know anything about it. My debate is the Thermal comment. I've owned two different Thermals; they were excellent on both vehicles.