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The 2011-2016 Ford 3.5L has an inherent design flaw where not all of the OE stud locations are utilized by the OE manufacturer which leads to warped exhaust manifolds, broken exhaust studs and blown manifold gaskets. The cylinder head on Fords 3.5L Gas Ecoboost has threaded holes for 11 exhaust studs to be used, however the OE manifold only utilizes 8 of those stud locations. BD has designed a manifold that not only utilizes all 11 stud locations, but also improves exhaust flow and has improved durability, the way it should have come from the factory. BD's Ford 3.5L exhaust manifolds are made from thicker-walled high silicone ductile iron designed to resist thermal warping. Each kit includes 22 exhaust spacers and 22 class 8.8 studs designed to further improve thermal durability.
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Sounds great and runs better than ever. Excellent product, definitely a upgrade over stock.
Very easy to deal with, quality products & seams to do the job
Best option for replacement if you find your OEM exhaust manifolds have failed due to broken mounts and leaking. Another example of how 3rd party parts can actually be superior to OEM. Check out how these mount using all of the critical points as Ford should have..and failed to do so!
Excellent quality, fit and performance
BD made the manifold the way the OEM part should have been made with the extra mounting points for the extra studs. Boggles my mind that the stud holes were all ready in the block. Not an easy job, so don’t waste your time money and sanity with the OEM design!!!
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