I am already running the Flowmaster Outlaws on the Mustang, nice deep loud growl from it. Installed the BOSS side exhaust pipes today, no baffle, wide open. Now the exhaust is overall more quiet than the exhaust was with just the Outlaws.
The overall tone is deeper now, which I like, drone is less at highway speeds overall, but heck at times I can barely hear the exhaust now. Who would have thought, and here I was concerned that with the open BOSS side pipes it would be TOO loud.