Fits: 2011 thru 2014 Chevy Silverado/GMC 2500HD/3500HD LML Duramax Diesel

Max-Flow Race Series Manifold & Up Pipe Kit for your 2011-2014 LML Duramax Diesel. These are meticulously designed to increase engine output through increased airflow. The gradual increase in internal diameter allows the exhaust manifolds to add volume while keeping the most velocity possible. Due to the heat and energy of the exhaust gasses being expelled, expansion will occur within the manifolds and up pipes which will cause an even stronger spool up through the turbine side of the turbo.

The increased diameter of the manifold will be able to send these hot exhaust gasses through the turbine as fast as possible, making it easier for the turbo to spool. The Silica-Moly Cast Iron material also has the ability to retain heat ensuring the heat stays within the manifolds. Quicker spool times have been seen with these manifolds over aftermarket headers because the headers will actually increase the distance the gases need to travel causing some cooling before the exhaust gases hit the turbocharger.

• Reduced back pressure
• Better fuel economy
• Quicker spool up and lower EGT's
  
• Up to 55% increase in airflow over stock
• High quality Silica-Moly Cast iron manifolds
• 304 Stainless Steel .120" wall up pipes with internally sleeved bellows
• EGT probe port pre-molded and tapped in each manifold for convenience and increased strength

Includes:

• Left & Right Max-Flow Manifolds
  
• Left & Right Up Pipes (EGR intact)
  • 100% Brand New Up Pipe, No Used Parts, No Core Charge!
  • Retains EGR Provision with 100% Brand New Stainless Steel 304 EGR Bellow
• 16x Exhaust Manifold Bolts
• 2x Brass EGT port plugs

​Optional Gaskets:

• Up-pipe gasket set (4 gaskets)
• Engine Block to Manifold Gasket set (2 gaskets)
• LML EGR Up-pipe Gasket (98065519)

• Manifold and up pipe gaskets are NOT included, we recommend replacing them if you do not have new ones already
• We also recommend the downpipe bracket for customers running this kit with an aftermarket downpipe
• PPE downpipe is recommended for best clearance & ensure correct spacing
• Some aftermarket downpipes will require slight modification for correct clearance
• To reduce thermal temperatures under the hood pair with the Max-Flow Manifold Blankets

*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.*