ZZ Performance
You can get that and it welds right to the stock piping. Or you can have a local exhaust shop just make you one like I did mine. He cut the threads out of the U-Bend from the o2 Sensor and welded the piece with the threads connected back into the straightpipe.
A buddy of mine had a bone stock '97 and we would run all the time just for grins. I got the U-Bend put in (he would barely pull on me each time we raced) and it ended up on me nosing on him each time after that
And for $40, you can't complain, and yes you can keep the resonator also.
If it were me, I'd just save and get the full 3" DP/Cat Delete/U-Bend Delete Combo. That way you can kill three birds with one stone IMO.