its is, but not a identical, its much older for a start, its RBH52 i think rather than a newer RBF casting. anyways, what id really like to know is can i throw a p18 exhaust housing on instead of my p20 one (will it fit/hit exhaust blades) and alos very interested to know was a p20 housing sourced by @GP82 ? (to stay on topic and all that jazz) Phil