Good news. FedEX delivered my goods today so the VX will hopefully getting a mild tear down to get the goods in. FPR, EGR, and MAF all nice and shiny. I will certainly post updates on how well these treat the 171 and 174. Keeping my fingers crossed that the o2 sensors aren't part of problem.

Wish my Green drop in filter came today, but no luck. Such is life.