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Crooked Hole
10-02-2007, 23:07
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.
Crooked Hole
10-02-2007, 23:12
http://www.bd-power.com/gmc/product.php?pn=BD%20Duramax%20Manifold&tt=gmc
Kennedy
10-03-2007, 04:45
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.
More Power
10-03-2007, 10:41
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