|When introduced, the M5’s 400 horsepower (give or take a couple) brought gasps. An executive sedan with the power output of a supercar? BMW must be mad, was the general consensus. A short drive in an M5, however, will dispel any notion of a lack of capacity on BMW’s part. The M5 is a very sane exercise in moving a handsome, comfortable, and spacious sedan to extreme velocities with surgical precision. While you can certainly disable the traction control and have a smoky good time with hooliganish burnouts, the M5’s forte is pretending it’s a much smaller car than it really is. Its reflexes are taut, its brakes are among the best ever fitted to a sedan, and the engine is superb. It sounds it, too, as it breathes through eight individual throttle bodies for lightning-quick throttle response, and exhales though sweet-sounding quad pipes. Outside, the modifications over the standard 5-Series car are restrained, with alterations to the front and rear air dams, a rear decklid lip spoiler, and split-spoke alloy wheels. From a driver’s perspective, one of the best features is the excellent manual transmission, rare in this class of mid-sized sport sedans. Another is the excellent M-Division tuned suspension, which puts the handling of the M5 in a class above.|
— Official description 
The 2003 BMW M5 - abbreviated as BMW E39 M5 or BMW M5 '03 - is a RWD sports saloon by BMW that debuted in Forza Motorsport 4 and is featured in every subsequent Motorsport main title, as well as in Forza Horizon 4.
The 2003 M5, codenamed E39, is the third generation model of the BMW M5 and replaces the 1995 M5. Unlike its predecessors, the E39 was no longer handbuilt but was assembled alongside regular 5 Series models. It was also BMW M's first production car with a V8 engine.
|Conversion - Engine|
|V10 - E60 M5|
5.2L V10 (602 hp)
|Conversion - Drivetrain|
|Conversion - Aspiration|
- ↑ "Forza Motorsport 6 - Cars". forzamotorsport.net
- ↑ Abbreviation in Forza Motorsport 4
- ↑ "30 years of the BMW M5". motoring.com.au. Retrieved 03/06/18.
|1950s||507 · Isetta 300 Export|
|1970s||#25 3.0 CSL · #6 M1 Procar · 3.0 CSL · 2002 Turbo|
|1980s||M1 · M5 '88 (Forza Edition) · M635 CSi|
|1990s||#15 - #16 V12 LMR · 850CSi · M3 '91 · M3 '97 (Forza Edition, Horizon Edition) · M5 '95 · Z8 JB|
|2000s||#2 - #43 M3 GTR · #79 - #92 M3 GT2 · 135i Coupé · 323ti Sport · M3 '05 · M3 '08 · M5 '03 · M5 '09 · M3 GTR · X5 xDrive48i · Z3 M Coupe · Z4 M Coupe · Z8|
|2010s||#1 BMW M Motorsport M8 GTE · #5 125i M Sport · #24 M6 GTLM · #55 - #56 Z4 GTE · 1 Series M Coupe · i8 · i8 Roadster · M2 Coupé · M3 GTS · M4 Coupé (Forza Edition, Horizon Edition) · M4 GTS · M5 '12 · M5 '18 · M6 Coupe '10 · M6 Coupe '13 (Forza Edition) · M135i · M235i · X5 M · X6 M '10 · X6 M '15 · Z4 GT3 · Z4 Roadster · Z4 sDrive28i · Z4 sDrive35is|