I am 6'-2" and 205 lbs. My head has an inch or two of clearance under the soft top. And the seat has much more rearward travel than I can use. A friend has an old Miata, and it is a much smaller car, both outside and inside.
The seat tilt mod raises the front edge of the seat so that it supports the leg.... I can't drive without bending my right leg so much that it is not supported by the seat... and the seat raised...
I'm 6'3" and just clear the roof, no big deal because the top is down whenever possible.I'm 6-1 and fit comfortably in my 1998 Z3.. I do think that if mine had the convertible top head liner, I would have a tight fit. My 1998 does not have a head liner, so I have plenty of head room... I do however have the seat as low as possible...