I just wanted to share this because I am FUCKING excited about it. I passed CA smog at a STAR station. Yes a legit smog check. When I got my registration renewal it said I had to go to a STAR Station. I thought I would be screwed. I bit the bullet and took it in. I was a bit surprised with the results:

The smog tech said it was cleaner than his E39. I didn't do any prep other than change the plugs this morning. No additives or anything like that.
Car specs:
1987 325is
Mileage: 218027
Stock exhaust/original catalytic converter
AEM wideband sensor
M50 green top injectors
173 DME and WAR chip (91 oct tune)
Newly replaced spark plugs (copper +)

The smog tech said it was cleaner than his E39. I didn't do any prep other than change the plugs this morning. No additives or anything like that.
Car specs:
1987 325is
Mileage: 218027
Stock exhaust/original catalytic converter
AEM wideband sensor
M50 green top injectors
173 DME and WAR chip (91 oct tune)
Newly replaced spark plugs (copper +)
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