If you give me the tire rolling diameter in inches (or tire size, I can compute the rolling diameter) and 7th gear ratio, I can run a program and give you the answer. From memory, stock is 3.62, so you can multiply your rpms at that speed by 1.08 (3.91-3.62/3.62) +1) and you should be very close.
Regards,
Jerry
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'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
Well, since I have an E39, I can't go outside and look. But I will look it up and post here for you.
Regards,
Jerry
Edit:
According to TR, standard rear is 285/35-19, so rolling diamter is 26.9 inches. Assuming full lock up in SMG as it has no torque converter for slippage, 3000 rpm is 80 mph (79.9) with the 3.91. Since the BMW speedo is usually a little optimistic, you may see a slightly higher speed reading at the rpm.
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'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
Last edited by gsfent; 4th November 2009 at 23:09.
. But I will look it up and post here for you. 
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