Ok... Installed the airbags. The don't seem to be leaking, so I guess I plumbed them alright. I have them at 30psi now and don't really notice a difference in how it drives, but I'm hoping it helps the rear end out when I'm towing. I should be loading up the trailer tonight, and towing my car home in preparation for an alignment and lots of tires.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years