It looks like I may be bringing my 81 Euro to a CA Referee. Passed all Emissions except visual. He said a 1981 has an O2 Sensor. This is true of it were a US Model 928 in 1981. US Models had the O2 Sensors since 1980. 1979 was the last of the O2less and CIS Injection. European Models had the O2less with CIS until 1983. How can I prove this? I am thinking a statement on a Porsche Letterhead before going to the Referee. I was told I will need a new BAR Decal to say that my 928 needs to be tested at 1979 US Specs.
I really can't believe how lame this is as I passed all my tailpipe emissions to spec. Co, HV and Nox. Any Suggestions before I see a Referee?