Wellrooted, I just had my HPOP rail plug replaced on the drivers side. I took it to the shop, cuase it was only 130.00 installed, and could not break it loose with the 1/2 in driver socket. It is like 17.00 from International, and on the pass side, I might think the downpipe has to be moved a little to get in there. Good luck, and if not for The Diesel Stop advice, I would have just continued to mark. " PowerStrokes do not leak, they just mark their territory!!! " Colin /ubbthreads/images/graemlins/wink.gif /ubbthreads/images/graemlins/wink.gif