DHD's new thick wall tubular manifold bundle increases exhaust air flow over 45% without any port modifications. An additional 30% in flow gains can be found in port matching and port blending. These race manifolds are constructed of thick wall .130" stainless tubing, 1/2" thick steel flanges and tig welded inside and out. Included in the race bundle are our .120" wall thickness 304 stainless steel up pipes, featuring sleeved bellows and double welded pipe/flange connections.
Going tubular will save weight and improve fitment around engine mounts, control arm mounts and aftermarket cold side pipes.
We have over a year into testing these manifolds on multiple competition vehicles, including our ProStreet truck Last Minute Hooker. We are confident in their ability to flow and withstand extreme EGT's. You wont find a lighter, higher flowing, more versatile Duramax manifold.
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