with polycarbonate to reduce spall. The 540i Protection is rated to withstand the impact of handgun fire up to and including .44 Magnum, the glass is also protected from attack with blunt objects such as baseball bats and bricks. The additional security measures brought an additional weight of compared to the normal 540i sedan. on request, an intercom system was available and from January 1998 run-flat tyres were available. Model year changes Most changes occur in September each year, when the changes for the following model year go into production, as is typical BMW practice. Therefore, the changes for 1996 represent the 1997 model year, for example. 1996 Station wagon (estate, marketed as "Touring") body style introduced. 525td model introduced. 1997 On-board computer upgraded. Cornering Brake Control introduced. Rear side airbags introduced. 1998 M5 model introduced. Lower-body rear side airbags were standard on the M5, remaining optional for other models. M52 straight-six engines updated to M52TU. M62 V8 engines updated to M62TU. 530d model introduced, using the new M57 straight-six turbo-diesel engine. Xenon headlights introduced. Parking sensors ("Park Distance Control") introduced. Self-levelling rear suspension introduced for Estate models. Stability control upgraded (from ASC+T to DSC). Self-Adjusting Clutch (SAC) introduced on the straight-six petrol engines. Air conditioning, electric rear windows and on board computer added to standard equipment Satellite navigation upgraded from MKI (or Mark I) to MKII. Like the MKI, the MKII uses a 4:3 screen and stores the maps on a CD. 1999 Rain-sensing windshield wipers introduced (June 1999) Front seat airbags upgraded to dual stage 520d model (using M47 inline-four engine) introduced, replaces the 525td model (M51 engine). 525d model (using M57 engine) replaces the 525tds model (M51 engine). 2000 facelift The E39 facelift (also known as LCI) models began production in September 2000 (for the 2001 model year). 520i, 525i and 530i models (using M54 engines) replace the 520i, 523i and 528i model (M52TU engines). 530d model receives power increase. Kidney grilles on all models are changed to those of the M5. Revised "angel eye" headlights. Revised tail lights with LED running lights. Navigation screen updated from 4:3 to larger 16:9 widescreen. 2001 Automatic transmission cars had the manual shift direction switched (to forwards for downshifts, backwards for upshifts). Front brakes were upgraded with 324mm discs and new calipers on 6 cylinder models. Automatic headlights introduced. In-dash CD player becomes standard equipment on all models. Power passenger