had a question about my 85 gt. it has stock heads E5TE,s. i was wondering what size headers fit on these heads. are they 1,1/2 or 1,5/8 . reason i ask is because when i got my car it only had a fake dual exaust system. so i bought a h pipe off a 88 gt, put the h pipe on my car but they wouldent fit on my stock headers, so i got the headers off the same 88gt bolted them on and it worked good. but if my heads are 1,1/2 how come the 1,5/8 bolted up to my stock heads without any probs. thanks