just to clear this up the hooker swap headers for pinto do not bolt on a mustang ll. I had researched this and read on several forums that these will work. sooo 500.00 and 4 months waiting. I try to install these. after much work I finally got them mostly installed. after cutting both collecters off, got the passenger side bolted up and had to pull them with a wench and a strap hooked to the area where the collecter used to be, and pulled it towareds the drivers side, then heat the bends with a torch. so that it would stay in place,it fit. the drivers side is another story one of the tubes hits the rod hooked to the lower a frame.and where it hooks to the header had to be heated and bent down so it clears. that tube has to be cut and re welded to clear. in other words if you are not a fabricator dont bother.