Yeah it sounds alot better. Not really louder but deeper. I cut the stock pipe out of the plate and welded a 2" pipe that I cut the angle on. Added a spark arrestor behind it too. All for 7 bucks.
Here's a tip I bought for a 680 Rubicon, it bolted right on, and yes it does make a difference in power output. I'm holding the stock one in my hand. A whole lot less restrictive.