Dodger, Header size is a consideration. For a 440 1 7/8 to 1 3/4 is just fine for most street applications. You would not want to put 2 1/8 headers on a warmed up 440. What I was referring to is putting and 1 1/2 inch exhaust pipe and mufflers behind headers. If your using headers sizes listed above, I would use at least a 2 1/2 inch exhaust system. (pipes and mufflers behind the headers) Sorry for any confusion. Earl ---- 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. This email was sent to: arc.6265@xxxxxxxxxxxxxx http:///u/?.. Or send an email to: 1962to1965mopars-unsubscribe@ http:///?p=