Junior Member, warming up (<31 posts)
Join Date: Oct 2018
Location: Tokyo, Japan
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In 1991, Canadian cars had a meter in kph?
The absence of air bag is probably normal, mine is from 1992 and also has no airbag (Japanese market car), in Europe it was optional.
Big noise at cold start is probably the air pump indeed. Look for leaks, mine had a badly cracked hose (half of it disappeared) so it was very noisy.
Bringing back SLS depends on how it was deleted, I did not experience it myself but I understood from various post on this forum that you can do it the simple way by just plugging the hydraulic systems but this usually ends with the destruction of the pump, or you can do it the hard way by modifying the pump or using a pump from a non-SLS car... Depending on what is done it can be more or less difficult to revert back to the origin. Aside from this, you will also need to find used rear shocks since those are NLA from BMW, but this does not seems so complicated, either on this forum, although is seems very quiet lately or there is a Facebook group where you can find some parts too (you might need to have them refurbished though).