There are differences in all of the header's listed, be sure to look at the spec sheet on Summit for clearance issues. As mentioned, only the Hooker super comps (5115), TTI ,and Doug's headers go above the steering, the rest go below and have pretty short ground clearance. Some will not fit certain types of steering, and others require a mini-starter to be installed. The Hooker super comps are supposedly good with either type of steering, and the original starter. Doug's can be used with either steering set up, but I believe require the mini-starter. Not sure about the TTI.