I'm running Hervey headers with a single Magnaflow Tru-X muffler mounted behind the engine in the stock muffler location. I had the pipes custom bent at a local exhaust shop. I've been happy with the look, sound and performance. Others have said that the Hervey headers with the dual Flowmasters are considerably louder, but I've never actually heard that particular setup, thus I can't speak to that system firsthand.

As noted in other posts, I'm also running the Peugeot 604 carb with the dual Solex carbs. I've been planning on getting 5052 dynoed, thus when I do I will post the results.