The indoor track is $ - much better than running outdoors. Ask them to raise the corners for you so that you can go faster, it's pretty cool. The air is fine in there.
Anyway, I'm sure you'll be ok. You stress out way too much.
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'07 e90 335i: Monaco/Lemon ZSP ZPP ZCW (gone)
'02 e46 325ci: BSM/Black ZSP ZPP 5MT
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