I had Mac Boomtubes without any other mods and they sounded great but droned in 5th gear at 60mph.
Went to Mac long-tube headers with Mac off-road ProChamber, sounded nasty but was extremely loud and drone was unbearable at 5th gear and 60mph.
My current set up is Mac long-tube headers with Mac off-road ProChamber, and Bassani Race axle-backs and I love it. Quiet when I want it to be and loud and throaty when I want it to be.