MANHART Previews Its 600 HP+ BMW M3 and M4

German tuning house MANHART is known for two things: its black and gold color scheme, and adding an immense amount of power to popular German cars such as this 900 HP Audi RSQ8 and the BMW M8. For its latest project, MANHART has shown what to expect from its upcoming BMW M3 and M4 tune -- yes, the above images are renders, but chances are the real thing will look very similar to the illustrations.While the aftermarket upgrades aren't currently ready, we can see that MANHART's MH3 600 and MH4 600...