The internet is just full of information with folks like yourselves and just doing some searching around. I found this site that discusses the dutra exhuast manifolds, clifford headers, super six intake manifolds, what size recommended exhaust system for each and a ton more of information. Thought I would share it with the group for those of you who maynot have seen it before. http://slantsix.org/articles/supersix/article.htm Garry Penn 65 Bel 1 2dr Sedan ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.