I've been doing a lot of research on headers. I was told to go with shorties. Others say shorties will do nothing. I've read on some mustang boards that shorties will do nothing, and that long tubes is the way to go with the 4.0 SOHC. In all my research I've came to the conclusion that no one knows what the hell their talking about with headers on a 4.0 SOHC. That being said, I was planning on going with Gibson shorties, however, if long tubes are the way to go then maybe I should try these instead? We need some darn clarification here. What headers work for the 4.0 SOHC? The cast manifolds can't be the best thing for this engine. What makes this engine so much different that any other engine. Why will the headers not equal a gain for the SOHC? Need some answers here that make sense. Not opinions, true facts. Has ANYONE tried long tube headers on the 4.0 SOHC? If so, let me know what you think. Anyone know of anyone that tried this?