Took another step toward completing a transition over to a Bosch RS4 MAF sensor by acquiring an RS4 Airbox top.  The lower half of the RS4 and S4 airboxes are nearly identical with the RS4 airbox just having a port that opens to allow more air in.  The darintake modification, cutting openings in the lower half of the stock S4 airbox accomplishes the same function so that the only needed piece of the intake is the top half of the airbox that attaches to the 83mm RS4 MAF housing.

Another benefit to having the RS4 airbox on hand will be to flow test it versus the stock airbox.