Dave - After reading your post, I just had to reply. I removed the engine piping on the back of the heads of my 318 EFI Imperial several years ago. These pipes are not stainless and very likely to rust out. The big surprise to me to me was that there "were no air openings in the rear of the heads!!!" I was flabbergasted! I have had that car inspected every year and had no hose nor that pipe installed and the car runs fine when cold and easily passes the ever increasing requirements of the local laws. Take a look at yours and see what you have, we'd all be interested in your reply... Bob Harris '81 EFI car.