It is my impression that only the 96/97 3.8 MN12's had the option for headers. Just had a brainstorm. Are the heads from a 96/97 3.8 MN12 compatible to swap onto a 91 3.8? I was planning to get the stock manifolds ported and/or jet hot coated. If this swao is possible, it will be on the menu. Just wondering how the clearance will be. Any input...?