Both the Thule Passage, TH911XT, and Archway, # TH9010XT, are good choices, there are 3 main differences between the two racks. First, the Archway has a covered cable that secures the rack in the trunk when installed. Second the Archway rack has an integrated locking cable to secure the bikes to the rack. And finally, the Archway has longer arcing tubes to help with fit on vehicles with OEM rear mounted spoilers.
The installation procedure for each of these racks is basically the same, one no view full answer...
The Thule Speedway 2, part # TH961XTR will fit your 2006 Infiniti M35. There are 4 rubber pads on the corners of the frame of the rack to prevent scratching the vehicle and the trunk hooks are rubberized as well.
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