I have a 94 gsr and i have a DC sports 4-2-1 header on it. The header has a O2 bung hole on it and i have a extra o2 sensor put on it. My year gsr has 1 o2 sensor and its on the cat so i don't need the extra bung hole for anything. So my mechanic put a extra o2 sensor there. The problem is that it rubs agains the oil pan at low rpms and makes a nasty noise. Im wondering if this is from a newer GSR like OBD2 and if the oil pans are different on thos GSRs than the ones on the 94 gsr. What would be the best way to remedy this problem?