Sounds great. Can be quiet when you need it to, but nail the gas and it screams. Drone is not too bad with my combo, but I'm not drone sensitive either. The stereo can still overpower the exhaust.
Not true. There are still catted midpipes that throw the code. The aftermarket cats aren't as restrictive sometimes and will let enough carbons through to throw the light. Mil elims may still be needed.
The prochamber has the mid section which quiets the sound a little also. The stock midpipe and catted prochamber are about the same volume with different tones. Personally, I wouldn't pay the extra money for catted just to have my car as loud as stock.