Legally speaking LB7 without an EGR or Cat, as in technically its illegal to remove the Cat off trucks that were equipped with them which would include some lb7's all lly's, lbz, and lmm's. EGR's are illegal to render inoperable on the same list. And LMM's have the dpf which is illegal to tamper with. But so is just about every mod you can do to your truck. So really just screw the republic of Kalifornia and buy whatever truck you like the most, and proceed with modifications, you can always bolt your stock exhaust back up, if they ever get any where with diesel emissions testing. Or by a diesel of 96 and earlier vintage.