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Exhaust Manifold
Has anyone changed the lefthand Exhaust manifold on their Duramax for an aftermarket one without the clearence for steering column shaft? Am being told that the factory manifold flows 20% less with this indentation than the other side, and that it is not necesary.
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You will not feel the difference, but loking at it tells a guy that it's a imbalance. Changing it should help balance the exhaust flow between cylinders.
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Of those who have installed a pyrometer in both the right and left exhaust manifolds, all (that I've heard about) have reported a higher EGT reading in the driver's side manifold - including myself. But.... I have not heard of any of these dual installations using calibrated and matched pyrometers & gauges.
Jim