7. Audi TT’s Unexpected Spoiler
Early versions of the Audi TT faced surprising stability issues at speed, prompting Audi to add a small rear spoiler as a rapid solution. This last-minute fix not only improved safety and handling, but also gave the TT a sportier, more aggressive profile. The spoiler became a signature design cue, appreciated by enthusiasts and often emulated by competitors. More at Car and Driver.