*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))*
*This product is ONLY designed for closed course racing where it is legal to do so. Any other use will be in violation of local, state, and federal laws. We are not responsible for unlawful use of this product.*
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.
Features / Benefits:
Reduced Back pressure
Tubular Construction Allows Direct Mount Wastegates
Save 5lbs Per Manifold vs Cast (9lbs vs 14lbs)
Increased Chassis Clearance
Improve Fuel Economy
Lower EGT's and drive pressure
Quicker turbo spool up
1/8NPT Bungs in each manifold for EGT or Drive Pressure Sensor
The passenger side up pipe is D shaped to allow for use with most aftermarket downpipes. However, slight modifications may need to be made to get the best fit depending on downpipe brand.
There is no EGR riser on the passenger side up-pipe. This kit is not a direct replacement for trucks equipped with EGR and should only be installed on pre-emission equipped trucks or vehicle not licensed for street use.