The only exception to this are the Dutra Duals and manifolds with a hot water provision. The Dutra Duals twin manifolds are based on the stock manifold and retain the heat riser for use with a manifold that is compatible.
I thought the Dutra Duals "twin" manifolds were 2 3 into 1 manifolds that were completely divorced from the intake? The hybrid Dutra front and Modded rear stock manifolds retains the heat riser to the intake. Just an observation. Water heated I suppose could be done by bolting a gasketed plate to the bottom of the intake and running the water through the EGR port?
