Dynomax Ultra flows

I have them on my Dart w/ a 360, x pipe and TTI tailpipes. They do drone at 2K. The idle is similar to demon seeds car, but at full throttle it has a higher pitched sound????? It doesn't sound anything like my buddies small block cars. I don't have any sound bites. I can tell you the car runs the same at the track thru the mufflers or with the cutouts open!!!!!

Bob