From the Super Mario Wiki
The Gold Glider is an unlockable glider in Mario Kart 7. It highly resembles the Super Glider, except that the Gold Glider has a golden color surrounding it. It can be unlocked by connecting with 100 people with StreetPass, or by collecting 10,000 coins. The Gold Glider does not offer any stat boosts and is therefore a purely aesthetic unlockable. It does, however, slightly increases the kart's gliding distance.
When the Gold Gilder is combined with the Gold Tires and Gold Standard body, they complete the whole Gold Standard. This kart gives great speed (the 2nd biggest boost in the game) and good weight, but has a bad handling boost and abysmal off-road (the smallest boost in the game).
The Gold Glider returns as an unlockable glider in Mario Kart 8. Instead of being entirely gold, it is now black with a gold ring and a number eight on top.
Mario Kart 7
Whole Gold Standard
Mario Kart 8
Names in other languages