I just called NWOR to order a set of 2.7 headers and they were out of stock because one of the orders were damaged in shipping. I talked to the mechanic there and he said that since the flange is two peice some how they got tweaked and some of the holes dont line up. He said that you drill new holes and the ports will still line up, thats it. They are selling them for half off shipped. Also not sure if your aware of the price increase, they now cost $447 reg price. So i got them for about 260. Just an FYI if your in the market.