To get your car to be sponsored for show, the best way is to win some shows first.
Most companies won't take a chance on an unproven person if there's already someone out there who is getting recognition.
The bulk of the show cars out there that have sponsors are either 1) built by that company ground-up and owned by either said company or an employee, or 2) are owned by someone who has already put in a large amount of time and money into their car and has already won shows.
Build your car for the type of sponsors you're looking to attract.
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