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CATS for MOT emissions failure

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First time poster yaaa!!! i own a 2004 fairlady Z, DE engine but it has horrifically failed the emissions test after trying all the tricks; welded all leaks, nice high rpm drive before testing with cataclean treatment, red hot cats on testing; everything but no joy after many attempts !!!!


It has a berks high flow cats on but thinking it’s done it’s time, obviously stock Nissan new are around £2000 and I hve seen the tarmac sportZ HFC for £400, anyone got this and it’s passed through MOT like they claim?!!


just looking for some advice on the imports !! Cheers everyone!!

Edited by RyAnMcD
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How old are the cats, do you have a receipt in the history folder? Maybe they have just degraded/expired? I put them onto my old 2004 DE along with a nearly new Miltek and they passed with a bit of work i.e. giving the car a run and then when testing blipping the throttle.

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