I bought a new 2012 135I in October. Most of the inventory of the lot did not have the Navigation package -- surprised me, both that it was an option and that so many vehicles would have been ordered without it.
I test drove a non-Nav 135is with the BMW Garmin installation kit on the right of the binnacle, done by dealer for an employee. Garmin tended to vibrate quite a bit on idle and at low speed, making reading impossible. I suspect mounting on the left of binnacle would improve rigidity -- less flex at edges of dash.
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