My car was a lg4 car, and that is th eedelbrock headers and cat back system I have (made for the LG4) The cat back is 3 inch but is a flange 2.5 where the cat bolts to it, the shop could make a adapter to put there, but what system would fit my car that has a 3 inch why pipe? also what do i do about teh vavle in the pass side header tube? ( I think they call it a early fuel vapor somthing/heat riser) thanks a lot

P.S edelbrock is not much help I have called them 3 times and have gotten 3 diffrent answer, all of the same guy. Thanks