I installed the SteinAir static ports one bulkhead forward of where Van's wants them. I went by a photo in the SteinAir instructions. In their defense, they do say to put them where the manufacturer wants them. I called Van's, and they said this is a common problem, and that they have no data on what if any problems this causes. In fact, the Van's pop rivet supplied instructions point to the forward bulkhead, rather than the one in the plans. Does anyone have data on this forward location working well or not? RV-9A