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Exhaust Manifold
You can see the difference

Balanced exhaust flow for more power and lower EGT’s!

The factory driver’s side exhaust manifold on the 2001-2010 Chevy 6.6L Duramax engine is pinched down to allow for steering shaft clearance, which is actually not required. As a result, this serious restriction affects the driver’s side front two cylinders, flowing only 80% of what the passenger side flows causing an imbalance between the two banks and additional heat build-up.

Aftermarket exhaust manifolds that increase the internal bore size of their units compared to the port size on the cylinder head cools the exhaust inside the manifold only, but, the temperatures inside the combustion chamber is higher because of less turbo boost.

This has a negative effect on engine performance as it decreases turbo drive pressure energy and falsely lowers EGT readings. EGT is normally monitored by the driver to determine cylinder temperatures and by changing the base temperature referred to can result in engine damage.

BD’s Full Bore exhaust manifold restores exhaust flow balance, improves power and reduces EGT’s inside the combustion chamber. All of which is accomplished by maintaining internal bore size thus maintaining turbo drive pressure. Get better performance and save hundreds of dollars by using BD product versus other aftermarket manifold kits.

Made from high-silicon ductile iron, the Full Bore is a direct, bolt-in replacement for the factory manifold and is even drilled and tapped to accept the most popular EGT probes.

Product Warranty 36-Month Part
  • Available Makes
  • Chevy
  • Available Engines
  • 2001 - 2010 6.6L
  • Available Transmissions
  • Automatic
  • Manual
Product Rating
  • (3.7 Ratings)
    Write a Review
    Installation: 3 points
    Performance: 3 points
    Read 7 Review(s)

    • Installation
      1 2 3 4 5 3
    • Peformance
      1 2 3 4 5 4.4
  • Customer Reviews
    Showing most recent reviews
    brent - Dec 14, 2011
CloseOnline Reviews:
  • Dec 14, 2011
    Installation: 2
    Peformance: 5
    Reviewed By: brent
  • Oct 18, 2010
    Installation: 5
    Peformance: 5

    I had BD install this product. The effect on EGT's is very posittive. Normal driving at highway speeds now has EGT's as low as 550 versus 800 and steep grades at 900 versus 1150. Truck is a 2003 LB7 with approx 500 HP at rear weheels. I cant wait to tow to see differences.

    Reviewed By: Geoff T
  • Oct 21, 2008
    Installation: 2
    Peformance: 5

    The manifold fits great and works fine with the old gaskets, what the problem is they should tell you to remove the intercooler tube and disconnect the the sterring shaft, at least on my 2002 it is impossible to get off if the 2 studs stay in the block,the heat shield was not to bad to reshape.GOOD WORK BD

    Reviewed By: Brad Shutt
  • Aug 02, 2008
    Installation: 3
    Peformance: 4

    I have a 2002 Chevy Duramax and the steering shaft is no where close to the NEW BD Manifold.

    The steering shaft is parallel to the manifold and has just slightly more angle, how can the shaft get any closer?? If the shaft was almost straight up and down yeah, but this is not that case.

    I was told the stock design was for a cab over style truck and that is why the manifold was originally desgin by Isuzu for GM that way. For a vertical steering shaft.

    Also getting the old Heat shield to fit was not too bad, worth saving the cost of paying BD to manufacture a new one.

    People I own a Diesel Performance Shop, this is A SUPER NICE PERFORMANCE PIECE, ONE OF THE NICEST PIECES I HAVE SEEN. LOOKS FACTORY!!! Well deveploed, Made out of the correct material for longevity. Tapped for a Exhaust Probe. What more could you ask for???

    AAAA++++ and my hat off to BD on this part.

    I recommend them to all my customers, you have to get the heat out people, restriction makes heat which is the killer!!!

    Kevin - SSM - Seven Saturdays Motorsports

    Reviewed By: Kevin

1041460     Manifold, Exhaust - 2001-2010 Duramax