I'm getting the MRT full exhaust system from the first GB. I just got a notice for the recall of the front O2 sensor. I read some comments in the Borla header threads about possible fumes from the newly crafted header fouling the O2 sensors.
My question is, should I get the O2 sensor replaced before or after I get the MRT exhaust? The dealership whining about my exhaust is not my concern, but the effect (if any) on "new exhaust" fumes killing the new O2 sensor is.