So I'm pretty sure my headers are cracked, i realize that this is a common problem for the 4.0. mine are still factory original from 91 and have been welded once. my problem is i cant pass smog for the life of me. you name it, I've replaced it and/or tested it. the only things that haven't been replaced are the headers and fuel injectors.
long story short, what i want to know is what is the best way to check for a leak/cracks? I'm 80% sure they're cracked but i want to know for sure before i order another set.
also, I've been looking around for a replacement. i dont want to spend any more than $250. my top two right now are these. http://www.quadratec.com/products/17604_110X_PG.htm
any help/incite is much appreciated.