Give him some cardboard and masking tape and he'll completely transform your car...

Auto tuning is this art of customizing cars to make them truly unique pieces. We don't all necessarily have this desire to stand out and adapt this style. However, Max Siedentopf doesn't have this opinion. 
 
Armed with cardboard and tape, he customizes the cars of Amsterdam's inhabitants. The man does his work discreetly at night, since the vehicle's owners are not aware of what he's doing. He's looking to 'provide a service' to them, according to his account.
 
This photographer's work has given birth to a series of photos called Slapdash Supercars.
Here are a few models: