Why don't you sit in a V6 Highline since they have the Napa Leather seats the new 125TDI Highline will have. You can also upgrade them to 12-way electric adjutment with memory which I imagine offers all the lumbar support you'd want. To try that sit in a CC which should have the same seats with Napa leather and the 12-way adjustment. If seats are important to you and you will both be driving it then I'd be going for the seat upgrade with memory so you both have your own settings.
Bookmarks