i dont have a pre 93 4.0's lying around. but how much work would it be to fit a 91 4.0 borla header on a 98 4.0 have a guy local with one and just curious i cannon find this issue anywhere. i do know that a 91 stock manifold fits right on a 93 head.

 

It'll bolt right up, manifolds are the same from 91-99

 

Thanks alot