I got and Obx header for my 95 240 and the lower o2 sensor bung is way to big in diameter. I know that putting this header on removes the cat that was originally between the 2 o2 sensors, which renders the second one pretty much useless. The problem with removing the sensor completely is that it is most likely going to throw an engine code, due to lack of resistance in the circuit. And using an adapter to put the sensor in will also trip a code, since it will sense that the cat is gone. I just would like to know what people have done to remedy this situation, preferably a cheap solution that does not involve cutting the exhaust after the second cat (in my case it is a real cat).