Clairvoyant Posted June 9 Share Posted June 9 Hello fellow Z-ers, I took the car for it's first MOT since I've had it and it passed on everything except for emissions. It registered a CO of 0.44% (max allowed is 0.2%) Here are some more details: - DE engine - Cobra HFCs (unknown installation date) - I added Cataclean before the test and drove it for 40 mins - The car had 97 or 99ron only over the last year - It first recorded CO 0.72%, but after holding it at 3k rpm for 15-20 mins, it went down to 0.44 and wouldn't go any lower. The garage said I need new cats. I've asked around and someone suggested new spark plugs and air filter. So, my questions are: - are spark plugs and air filter going to make up for the difference to make it compliant? I don't know when they were last changed. - are new cats the only way to go? From searching on the forum, even new HFCs seem to be hit and miss. - has anyone had any experience with the ISR Performance HFCs. They are the only ones I could find that are 300 cell. https://www.tarmacsportz.co.uk/isr-performance-nissan-350z-vq35de-03-06-high-flow-cat.html Thanks Quote Link to comment Share on other sites More sharing options...
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