Check this out:

http://www.carchemistry.com/ccinserts.html

Has anyone tried one of these? I just put hedman long tube headers on my car (while I rebuilt the engine...had to lay the headers in place and lower the engine at the same time) and was looking for a different exhaust system.

Anyone ever try it? I was thinking the 3 disk insert.

I've never heard of anything like this before, but if it pans out, might solve a lot of people's problems.

 

I have heard of them. I heard they work great. Open headers performance while legal. Do a search for it on the boards, i believe it was discussed once before.