hijack also I have the same exact question as hp383 How much of a performance advantage is there? Currently running 15.0 E.T.s looking for 14s, I have the same combo 5.2 with computer and headers, and are they a direct bolt in with no wiring or plumbing changes? I found part numbers online , Ford: F1ZE-C2A and Bosch: 0280150943 after installation will the computer adjust for the better flow? Thanks! Great topic!