I found this link for decoding the the last seven digits of the VIN to see the original build specification of your BMW, it seems to list the full spec.
http://www.rubmw.ru/vincode/eng/
Don't panic about the engine power rating it's in KW you can convert to BHP here
http://www.which.co.uk/cars/driving/driver-tools/power-converter/
Type
Value
VIN WBABT32030*******
Type code BT32
Type Z4 2.5I (EUR)
E series E85 ()
Series Z
Type ROADST
Steering RL
Doors 2
Engine M54
Displacement 2.50
Power 141
Drive HECK
Transmission MECH
Colour STERLINGGRAU METALLIC (472)
Upholstery LEDER OREGON/SCHWARZ (LASW)
Prod.date 2003-06-30
Options
Code
Description (interface)
Description (EPC)
S230A EU SPEZIFISCHE ZUSATZUMFAENGE Extra package, EU-speciifc
S302A ALARMANLAGE Alarm system
S332A LM RAEDER TURBINENSTYLING 106 BMW LA wheel turbine styling 106
S380A HARDTOP-VORBEREITUNG Hardtop-preparation
S387A WINDSCHUTZ Wind deflector
S399A VERDECKBETAETIGUNG VOLLAUTOMATISCH Softtop, electromech. all-autom.
S423A FUSSMATTEN IN VELOURS Floor mats velours
S428A WARNDREIECK Warning triangle and first aid kit
S431A INNENSPIEGEL,AUTOMATISCH ABBLENDEND Interior mirror with automatic-dip
S441A RAUCHERPAKET Smoker package
S502A SCHEINWERFER-WASCHANLAGE Headlight cleaning system
S520A NEBELSCHEINWERFER Fog lights
S521A REGENSENSOR Rain sensor
S522A XENON-LICHT Xenon Light
S534A KLIMAAUTOMATIK Automatic air conditioning
Code
Description (interface)
Description (EPC)
S662A RADIO BMW BUSINESS CD Radio BMW Business CD
S672A CD WECHSLER 6-FACH CD changer for 6 CDs
S676A HIFI LAUTSPRECHERSYSTEM HiFi speaker system
L812A ENGLAND/IRLAND AUSFUEHRUNG NATIONAL VERSION GREAT BRITAIN
S863A SERVICE KONTAKT-FLYER EUROPA Dealer List Europe
S877A UEBERKREUZBEDIENUNG ENTFALL Omission of non-combined operation
S880A ENGLISCH / BORDLITERATUR Bordliteratur englisch
S925A VERSANDSCHUTZPAKET Dispatch protection pack
Standard equipment
Code
Description (interface)
Description (EPC)
S224A FAHRDYNAMIK CONTROL Driving dynamic control
S255A SPORT-LEDERLENKRAD Sports leather steering wheel
S550A BORDCOMPUTER On-board computer
S853A SPRACHVERSION ENGLISCH Language version, English
http://www.rubmw.ru/vincode/eng/
Don't panic about the engine power rating it's in KW you can convert to BHP here
http://www.which.co.uk/cars/driving/driver-tools/power-converter/
Type
Value
VIN WBABT32030*******
Type code BT32
Type Z4 2.5I (EUR)
E series E85 ()
Series Z
Type ROADST
Steering RL
Doors 2
Engine M54
Displacement 2.50
Power 141
Drive HECK
Transmission MECH
Colour STERLINGGRAU METALLIC (472)
Upholstery LEDER OREGON/SCHWARZ (LASW)
Prod.date 2003-06-30
Options
Code
Description (interface)
Description (EPC)
S230A EU SPEZIFISCHE ZUSATZUMFAENGE Extra package, EU-speciifc
S302A ALARMANLAGE Alarm system
S332A LM RAEDER TURBINENSTYLING 106 BMW LA wheel turbine styling 106
S380A HARDTOP-VORBEREITUNG Hardtop-preparation
S387A WINDSCHUTZ Wind deflector
S399A VERDECKBETAETIGUNG VOLLAUTOMATISCH Softtop, electromech. all-autom.
S423A FUSSMATTEN IN VELOURS Floor mats velours
S428A WARNDREIECK Warning triangle and first aid kit
S431A INNENSPIEGEL,AUTOMATISCH ABBLENDEND Interior mirror with automatic-dip
S441A RAUCHERPAKET Smoker package
S502A SCHEINWERFER-WASCHANLAGE Headlight cleaning system
S520A NEBELSCHEINWERFER Fog lights
S521A REGENSENSOR Rain sensor
S522A XENON-LICHT Xenon Light
S534A KLIMAAUTOMATIK Automatic air conditioning
Code
Description (interface)
Description (EPC)
S662A RADIO BMW BUSINESS CD Radio BMW Business CD
S672A CD WECHSLER 6-FACH CD changer for 6 CDs
S676A HIFI LAUTSPRECHERSYSTEM HiFi speaker system
L812A ENGLAND/IRLAND AUSFUEHRUNG NATIONAL VERSION GREAT BRITAIN
S863A SERVICE KONTAKT-FLYER EUROPA Dealer List Europe
S877A UEBERKREUZBEDIENUNG ENTFALL Omission of non-combined operation
S880A ENGLISCH / BORDLITERATUR Bordliteratur englisch
S925A VERSANDSCHUTZPAKET Dispatch protection pack
Standard equipment
Code
Description (interface)
Description (EPC)
S224A FAHRDYNAMIK CONTROL Driving dynamic control
S255A SPORT-LEDERLENKRAD Sports leather steering wheel
S550A BORDCOMPUTER On-board computer
S853A SPRACHVERSION ENGLISCH Language version, English