I picked up a used set of 1 3/4 tti headers to replace my old 1 3/4 headman b body headers. I also bought a 2 1/2 inch tti H pipe to replace my home built exhaust pipes and new tti 2 1/2 inch tailpipes to replace the factory 2 1/4 inch (2 inch at the tips) tailpipes. I was using Dynomax super turbo mufflers, but I found them a little loud at cruise. I did a lot of research on mufflers, and with the help of VOETOM, I decided to try the Dynomax VT mufflers. The system is installed now and I have had a chance to put some miles on it. It is exactly what I was after. It is very quiet cruising at 50-60 mph, in fact I hear more mechanical noise from the engine than I do exhaust. When you do put your foot into it the sound is more mellow than the super turbos. I am extremely happy with the change over. Unfortunately Tom told me that Dynomax has discontinued these mufflers.