flow and sound better

I like the TTI's step header design, 1 5/8 stepped to 1 3/4, if you can afford them. If not, the 1 5/8 headers from just about any mfg. will work fine. For the 318, I would use 2 1/4 lead pipes w/bal tube & tail pipes. On the 340 or 360, use the 2 1/2 stuff. For mufflers, I like the Walker Dynomax Super Turbo's, they will give you that Road Runner sound. They have a nice sound at idle, they get louder as you get on it. They will not drone as you cruise. Alot of people use the Flo-Masters, but in my opinion they don't flow as well as the Dynomax. They don't really have that Muscle car sound. They do have a tendcy to drone. I run the Dynomax 1 5/8 headers, 2 1/2 lead pipes, Dynomax S/Turbos, 2 1/4 tail pipes w/factory tips. My car is a street car, 1973 Dart Sport, junk 360, 904 auto, 3:91 gear. It has ran a best of 12:56 @105. Hope this helps.