hey guys i bought downey headers and crosssover and there is no spot for the o2 sensor to go? why would they not put this on there pipes? also the toyota o2 has a flange its not a screw in type so i cant even weld in a bung. what do i do? do i try to weld on two studs on to the pipe and try to make my own flange or try to find a screw in type of o2 and weld a bung in? help!!