If youre curious what it will sound like just take your muffler off and drive around for a day like that. With the delete pipe it will be just a little more toned down from there since the exit is behind the vehicle and not under it.
c'mon Mike, you're better than this. Very first post and didn't even attempt a search. There are literally a shit ton of threads on muffler deletes.
Now that I've got my old man rant out of the way...the delete pipe is significantly louder than stock, but the stock muffler was entirely too quiet and I like hearing the motor. I was following my Jeep one day and found it's got a nice tone and a cool little burble to it, much different than the sound while in the Jeep.