There are three distinct schools of car builders. The first is the 'scratch-built' crew, guys who fabricate a vehicle from the ground up. If someone can't find what he needs, he'll simply build it. He follows a blueprint hardwired to his brain. He thinks most cars have too much stuff on them, certainly more than he's going to put on his ride anyway.
At the opposite end are the OEM purists. They figure if it left the factory that way, it's already perfect. Typically, they go for OEM aftermarket bits as well: wheels, bike racks, floormats... if it's from the same manufacturer, it's good enough for their car.
The last group is the 'OEMPlus' contingent. These guys rely on factory bits and choice aftermarket suppliers to modify their cars. They tend to follow the factory's design, occasionally taking it a few degrees further. OEMPlus guys are well versed in parts code terminology and know a part number is more accurate than a verbal description. They know which chassis has interchangeable parts and where said parts were made and assembled. They know it's often more efficient to go straight to the OEM supplier, sometimes cheaper too.
Different Cars, Same Approach
The three cars here are examples of OEMPlus. While none is particularly outrageous, each has a little extra oomph to differentiate itself. The owners have respected the factory design while adding a few ideas of their own. We like that.