Wade - Would you be willing to part with those elbows and couplers? Name your price if so. Although I used the Vortech dryer vent, I have long suspected that my surging is due to some combination of the length, number of bends, and air disturbance of the inlet tube.
My only question is on the size of the elbows you have. I measure the MAF and blower inlet to be 4" OD. The dryer vent from Vortech is, of course, 4" ID. Are the elbows you have the same?