I'll admit I got careless with many of my 2.5 parts. I have a fuel rail with a gold regulator, a black one and a silver one. Then I have four ecu brain boxes with no idea which goes with which. Is there any identification on the boxes? Also is there a meter available to set the percentage of fuel on the ecu box? Somehow I feel like I should be sitting down when I hear the cost! On a related note, I was preparing for a 2.5 tunnel boat ride and a friend was "helping" me get it ready. He was connecting the battery leads and I noticed as he was tightening the positive cable, the wrench touched the ecu box and there was a small spark which turned out to be a $650 spark. Politely, I never told him what I saw him do as he had good intentions for wanting to help.