was lookin in my service manual and the 93 sc and na v6s have the same exhasut manifold part numbers. so my questions is i have 96 tublar headers on my n/a and have my cast ones sittin around. should i have my cast ones ported to put on the sc (are the numbers the same from 90 to 93?), and does my 90 sc auto have egr? or should i transplant the 96 tubulars on to the sc and what to i use for egr tube if i have it?