The six manufacturers in Star Wars Galactic Racer
Six manufacturers build the standard vehicles in Star Wars Galactic Racer: Jadrax Race Rigs, Kor Sarun, Gentes Race Customs, Sriluur Customs, Kuat Special Vehicles and Keren Resto. Each has a house style that runs across every class it builds, so a Sriluur Customs speeder bike and a Sriluur Customs landspeeder read as a matched pair.
The manufacturer is cosmetic. It changes the look and the livery a kit ships with, not how the vehicle drives, so picking a maker is a question of taste rather than performance.
Podracers have no manufacturer
The 14 podracers in Star Wars Galactic Racer sit outside the manufacturer system. They are named for their pilots rather than their builders, which is why Sebulba's Podracer and Ben Quadinaros's Podracer appear under no maker at all.