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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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This kit was perfect. It was very well packaged including the instructions. Boy what a difference in engine sound and performance these things made. Great design job. Will definitely recommend to anyone who has to do this to their truck.
What a pleasure working with quality components! Well designed and engineered replacing the 3.5 Ford Ecoboost manifolds with heavy duty units that utilize all of the stud holes in the head.
I now have a lot of confidence in my manifolds not leaking again. This job is a tough one but well worth it for the peace of mind.
Perfect fit Awesome upgrade Buy the turbo install kit separate and works perfectly
Installing these exhaust manifolds as by far easier than expected. I also installed a set of Screamer Turbos to get the full benefit and they went in with no issues due to the products. The only issue I had was on my end cross threading 2 studs due to having to install blindly from the strut mounts being in the way. No matter what I highly recommend these and noticed a gain in power, throttle response and better fuel mileage.
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