Does anybody know of headers for the 5.9 that have a collector larger than 2 inches? Does anybody know at what point they would become a restriction? Although I'm far from being an automotive engineer, 2 inches just seems a little small. I'm thinking of having a 2.5 dual or 3 inch single exhaust put on, and I'd like to have a little larger collectors if I could.

 

http://www.jegs.com/i/JBA/578/1945S-...60#moreDetails

 

You know, I was looking at the Summit site and never saw those. Now I also see another set. I don't know how I missed them, but thanks for pointing them out.