Hey Joe I use the Dyno-Max Ultra-Flows also. I use the welded ones like in this pic. But I had the last set on the car for 5 years and they were still in good shape. I only took them off when I put the new eng in this year as I went to the TTI 3" X-pipe system. I put new Ultra-Flows on because the old ones were kinked alot from the muffler clamps and I just went with new ones. I di think the Ultra-Flows are one of if not the best performance muffler since they are straight thru. Anyway I hope you had a great Thanksgiving. Ron

http://www.jegs.com/p/Dynomax/Dynomax-Ultra-Flo-Welded-Mufflers/744869/10002/-1