You can buy some steel wool at a hardware store, or even at a grocery store. It's like SOS pads...though I don't know if I would buy the ones with detergent infused in them. People have posted that you need to pack it in fairly snuggly and have reported that this works well.
Another thing you might consider is if you are going to get a dyno-tune done to your car, have the tuner omit the readings from those O2 sensors...they won't affect performance.
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2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD
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