My 1996 Tacoma 2.7L has a cracked exhaust manifold. I've been feeling like crap for weeks then finally realized that I know this feeling, carbon monoxide poisoning! I checked and sure enough, just forward of the rear cylinder there is a crack. Since I have to change it out I think I want to do street legal headers. (I have to do a smog check in the part of Texas where I live.). Any recommendations as to what are the best kind? Thanks.