I respect wanting to be as natural as possible. I'm the same way.
What I'm wondering in particular is how it messes with your brain, if you don't mind elaborating. I've been referred to these but, like you, am weary of putting all this stuff in my body.
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2010 E92 335xi FBO 6-speed (Space Grey over Tobago Blue)
2006 E90 330i 6-speed (Arktis Blue over Black)
1984 E23 733i 5-speed (Delphin Grey over Pearl Beige)
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