KRE is near Loudonville Ohio although they've got a Glenmont address. I have the E heads because I got a good deal on them and the KRE heads were "in production" at the time. The E's flow more and have more potential as a race head but the KRE heads have a much more modern combustion chamber and flow characteristics that are more ideal for street to street/strip applications. My E heads required 38 degrees of total timing to make max HP while the KRE heads would require around 24. That amounts to a big advantage on a mostly street driven car.