Associated exhaust manifold is constructed of Aluminum. 180-degree header which routes the tuned pipe facing the front of the truck. Will bolt to most popular .12 size engines (O.S., Yokomo, HPI, Dynamite). This header has no upward or downward angle. It is shaped slightly different than the one for non-pull start kits and they are NOT interchangeable.
Inside diameter: 1/2"
Outside diameter: 9/16"
Distance between mounting holes: 1-1/16"