Hey guys, thought I'd pass this along for those of you with fueling problems. I have a 2000 GTP that I put an IC on. I picked up a set of '04 rails to modify so I had a cleaner factory look. I lopped of the ends of each rail to braze on an inverted flare fitting. Inside the rail is an insert, much like a flattened tube. It is held in by a couple of tension springs. With it in there, it poses quite a restriction to the injector feeds (in fact it sits about a 1/32" right above the injector feed). It slides right out, and with it out the rail is much more free flowing. My best guess is that it's in there to reduce pulsations in the rail. It may be why so many '04s run out of injector, with so few mods.