The rev limiter is exactly that is limits the revs, but most after market tunes raises the rev limiter even higher. So I would not worry about it.

It's one thing I like about the M, is that when you are in manual mode you really are and the computer will not interfere and try to shift for you when it thinks you should shift.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software