Thanks again Demon. the reason i wanted to know is because i have a pre 98 lower that i am going to machine out and put larger butterflies in for the secondaries. i just wasn't certain. when i had my lower off for the cleaning i didn't pull the injectors. and when i pulled the feul rail off the older one, the mounting bosses for the return style injectors just looke dlike it might be a little different from the newer manifold. again, thanks for your help Demon