The pre-cat o2 sensor in my '92 Toyota Celica bolts on to the exhaust manifold rather than threading in (see picture below). I ceated a model of what I think would work for an extender for this type of sensor, which I know is in a lot of Toyotas and I think I also read somewhere that they are also in Saturns. Does anybody know what the cost would be to get something like this machined? Would it cost more than an EFIE?