Just past her MOT. Asked about the emissions. The tester said he measured Zero emissions! Probe was as far up as it would go.

 

Could it be something to do with the 5" Apexi rear pipes or are Z's just such clean running motors?

remove your cats then try that again lol.

There is also a pipe you can disconnect in the engine bay which has the same effect.

Make sure there is no pipes disconnected on in the engine bay

 

Mercs are the same!!

 

If the pipe was not inserted fully & drawing in air, the lambda reading would be out & your car would have failed on this!

 

 

Here is 'that' link :- http://www.300zx-twinturbo.com/tech/co/co.html

I removed my cats and still passed on emissions! Must be a clean runner.