Someone wrote:
"Or even hot rod "kiddie" (after market) stuff"

The term 'kiddie trade' was coined by after-market VW retailers to
describe customers who act in a foolish or immature fashion, such as
buying a chromed part to make their bug go faster, wrapping magnets
around the fuel pipe to increase their mileage and so forth.

Since the role of the retailer is to fulfill the demands of their
customers, they are quite happy to sell even items they know to be
decremental to the vehicle or engine. And yes, they are present even
within the aviation community, offering engines that will rust out
before they wear out, and so forth.

The term has nothing to do with age but with technologically naive
buyers, as in the taking advantage of.

-R.S.Hoover