There is a bit of wrong info here.
The E92 M3 comes with either FTM (Flat Tyre Monitoring) or TPM (Tyre Pressure Monitoring).
In Australia we have FTM which as has been mentioned above simply measures change in wheel diameter through a change in wheel RPMs. You need to reset this each time you change the pressure in the tyres, the car does a short reinitialisation over a few metres and uses this wheel diameter to detect any change if a tyre deflated.
TPM is standard in the USA as it is mandatory in all new cars over there, and has been since September 2007.
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BMW E92 M3 6MT, G-Power SKII supercharged, custom exhaust with 100 cell cats and Remus Sport mufflers, Brembo 380mm BBK, BMW Performance steering wheel, LUX H8 angel eyes, CF CSL boot, Hamann CF diffuser, Vorsteiner CF lip, CF grilles, CF gills, CF bonnet vents, BMW Performance stripes, RAC RG63 wheels, Eibach lowering springs, camber modifications.
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