Just installed headers ('96 NSX-T) and check engine light keeps coming on. Checked it with a diagnostic tool and the code is a "manufacture mixture problem". If I had the two cat o2 sensors reversed, could that be the problem? The o2 sensors on the headers are new OEM with the same part number. I had no problems before the header installation. Now,the car acts loaded up until 4,000 rpm, the clears out and runs great. Any advice?