Yeah - I have Pypes muffler deletes which are pretty loud. I laid my rear seats down to haul a few things home that I had I picked up and the decibel levels increased considerably - finally put the seats back up as the noise level was just too much.
My Ford Garage:
1965 ERA 427 Cobra Street Roadster
2017 Shelby GT350
Retired: 2008 Mustang GT; 2012 Mustang GT