I can only speak from all the magnaflow muffler I've hear and used and the cutback on my 2003 corolla. I sold a ton of magnaflow systems off of people hearing that car. They are very deep and smooth sounding. There never any really harsh volume changes with their system. They are quiet inside the car but enough for you to enjoy a good deep clean sound with none of the poppy gurgling sound. That's the way it was on my corolla and eclipse turbo.
2012 Focus SE hatchback sport, 203a, MTX-75, Candy Blue, Custom 2.5 Exhaust, K&N Typhoon.
Sonic Crew #012 E-123 Omega