depends on if you want to use the egr. manifold butterflys and electronic fpr controller i eliminated all of the above im running aftermarket header tho. so egr is gone.. the butterflys im not sure if they need to be proped open or not, i just run straight vac to the fpr and removed the 2 solenoids behind the valve cover... and took off the round thing that is conected to the egr. i can get pics soon if anyone dosent have them. . the pics and description are on ka-t.org