Quote Originally Posted by brianrupnow
Rams horns exhaust manifolds are not a damn bit better than headers. They are cheaper, if you can get them at a wreckers, but that is about the only benefit. The interior of the cast rams horn headers is an "as cast" surface, and will not flow as well as even a cheap set of tubular headers.
In some limited class circle burner racing years back we were stuck with stock exhaust manifolds.... Sent a set of rams horn manifolds off to have them "cleaned" internally by the extrude hone method..... they worked pretty good, but even then weren't even close to a good set of headers.....