Quote:
Originally posted by Chicane
I thought the engine (in stock form) ran a little bit RICH, hence the piss poor mileage, and black soot on the exhaust tips....
??
It runs lean in stock form???
Also, here's a page on how to read your plugs:
http://www.triumphspitfire.nl/plugs.html
- Rob
PS: Looks great man! 
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I suppose it depends on your definition of lean. It seems to run right around stoichiometric from 14.2 to 14.9. Best performance on a naturally aspirated engine is usually around 12.9. I ran a chip I set to right around that earlier and it made a great improvement removing all that "lag" we often feel. The fuel maps subaru used on the us model seem to be optimized for emissions.