Either cut out or CB extreme. You can pick up the muffler for 50 bucks online all day. I got no popping just a nasty(good) tone coming from my 4.7. I've heard myself the CB on a hemi and also a 4.7. The 4.7 WAS louder, you got me on why though.

 

bigger piping makes the 4.7 sound like a monster. I had true dual 3 inch into DI/DO magnaflow with a built in xpipe. That meshed with a good intake had people asking me If my HEMI was built lol.

 

I have 3' exhaust from the y, no cat and a magnaflow. coupled with an airaid intake, my girl rumbles as nice if not nicer than my ol' mans 66 440 Charger!!