Man, I never knew about this. I guess that is why I am running rich with shittiy mileage, black smoke (barely any) and a bit lower performance.
I never replace the o2 sensor because the check engine light never came on. D'oh.
Thanks 
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1991 White 240sx Fastback LE, rusty spoiler, weak driveshaft, exhaust rattle....
Rattles are just your cars way of saying 'I love you.'
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