DHD 300-119 Duramax High Flow Cast Manifolds Left and Right 2001+ LB7

DHD's high flow manifolds drastically increase exhaust flow without any port modifications. Additional gains can be found in port matching and port blending. Our 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

Want to make sure your getting EVERYTHING out of your investment. Considered purchasing our in house porting service. This service will port your manifolds to PPE oversize gaskets as well as gasket match the up pipe connection. You wont find a cheaper way to gain flow and lower EGT's! Use the menu above to add the option. Adding this option will add 1-3 business days to order processing.

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.