I am running Dynomax headers (with Jet Hot) on my 408 Duster. They fit great and clear the mini-starter (off a Magnum). They are priced right as well.
The old 340 had Hooker SuperComps that were a total pain to remove/install. I still have to run the drag-link thru the primaries with these Dynomax, but it isn't a big deal.
Mancini sometimes has manifolds if you call...these guys repop them as well:
http://www.accurateltd.com/340-Exhaust- ... p_162.htmlGlad you like the site...feel free to spread the word!
TTI is prob the way to go, but the downside, like hotrod340 said, is the cost.