I recall that NGK BP9HS are the recommended type from memory, but I fitted Accuspark Iridium plugs into my B20 144 last year and found starting and running so much better. Here's a link:
http://accuspark.co.uk/plugs.html
Paul.
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2017 V90 D4 Inscription, Mussel Blue, Amber perforated leather and lots of technology!
1973 1800ES, Gold, Black leather and very little technology!
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