If you want an aggressive sounding, pretty loud at high revs, but calm when driving down the highway, and has a 4" black tip then go with the Gibson metal mulisha exhaust. That's what I did and I wouldn't change it out for any other.

 

I would like one that's quiet at idle. No drone. And really isn't there unless I step on it. Stock location bit with a nice stainless tip

 

Already when u step on it stock the motor sounds great