Dirty Hooker Diesel 01-04 GM LB7 6.6L Duramax DHD High Flow Cast Manifolds

*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 high flow manifolds drastically increase exhaust flow without any port modifications. Additional gains can be found in port matching and port blending. DHD's manifolds are cast from the same high Silca Iron that's become standard in the high flow manifold market. 

DHD manifolds swept back tapered inner diameter port design will accelerate exhaust gases to the turbine, lowering EGTS and making it easier for the turbo to spool quickly. 

Note: Will not work with OE stock length up pipes. Must use DHD or comparable extended length up pipe.

Features / Benefits:

• Reduced Back pressure
• 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

Includes:

• Right and Left Cast Manifolds
• 2x 1/8NPT Port Plugs

Optional:

Use the Menu above to add Mahle OE Grade Manifold Gaskets and 4340 Chromoly 12pt Manifold Hardware. Up pipe hardware and Gaskets sold separately.

DHD: 300-119