These are the best quality headers on the market. Thick 3/8" flange included (Make sure you get this option! 1/4" flange which is standard tend to leak at the head) and ball and socket style collector ensures no leaks for years to come. Fits all IH scout v-8's Scout II and Scout 800. Will not fit IH pick ups. (Call to inquire about PU headers) Increases torque and engine efficiency. Nice upgrade. This does not have a California C.A.R.B. number. But it often does not effect the smog tubes and will often pass visual inspection.