The rumble at idle is Kool sounding ,but the Droneing at 60mph and up when cruzeing is anoying . Corsa, Magnaflow,and some others make a few more HP and a nice burble and no drone . It's all in what you want and will pay for .
If you want power and maximum flow with a nice mellow rumble and No drone get a Magnaflow ,if you want loud with a drone get a maremount vortex cherry bomb .