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This not only helps with engine braking
The runners have been ported to improve velocity and evacuate the cylinders
Direct Friction Allomatic
Vehicle maneuverability is reduced while in 4WD
Exhaust Manifold Set PowerStroke 6.4L - Ford 2008-2010 F-250/F-350/F-450/F-550 1990 This not only helps withThe 6. 4L manifold set is crafted with a heavy duty 0. 25" thick walled Hi Silicon ductile casting, this makes these manifolds thicker to combat cracking due to high exhaust temperatures. To maximize exhaust flow, computational fluid dynamics were used to optimize flow and exhaust port geometry. BD's exhaust manifold set is the perfect replacement for reliability, performance and peace of mind. Ports are gasket matched to maximize exhaust flow
