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Thanks, will do some digging as i'm struggling to find the factory Nox figures. Mine was born under Euro 1 so i'm not optimistic but some interesting reading below suggesting Saab were ahead of the game and yes i believe turbo's are generally better. There's also a parallel discussion about having the car tested in lieu of readily available documentation but it appears the process is not making waves due to cost and political pressure.
https://www.saabscene.com/threads/1999-saab-9-3-ulez-question.251616/page-2#nested_reply_top_post
jono84
This is the registration page - you need V5c and the some kind of proof - a homolgation letter is the listed, I've no idea if you'd be able to get in touch with a human to find out if there's a process for where that's not available....
https://tfl.gov.uk/modes/driving/compliance-registration/before-you-start
Mine was a late 90's car (non turbo - is it true that turbo's are generally cleaner?) and the NOX on the homologation letter was well within the limit. Love to hear if you managed to do it!