I use Dynomax Welded Ultraflows on my duel 3" ATR system.
You will love the sound. They are much quieter. I sold my ATR Pittbulls before they were ever used. I learned back when I had a stock block with a 2.5 system, they were too loud for me.
Even with a cammed stage 2 with 76 turbo, the Ultraflows still sound good.
Yes, I did. I got ATR to make a short Pit-bull to replace the test pipe. It was not real effective and did not stop the drone but it helped a little. They made them for a little while and discontinued them.
This was with my old 2.5 system.