a) Purchasing authentic products supports original manufactures, which will in turn help the consumer in the long run.
If the US automotive market is flooded with counterfeit products, manufactures from Japan might be less inclined to venture to the US. Result, US consumers will suffer by only being able to purchase counterfeit/inferior parts.
b) Authentic products are superior to their counterfeit copies:
In the automotive market, you do get what you pay for.
c) Authentic products are built and manufactured with quality and for the good of the consumer.
Counterfeit products concentrate on mass production, cheaper manufacturing and low quality
d) Authentic products make parts for the long run of the consumer.
Most counterfeit products are made and sold on a short term timeline, mostly to capitalize on fads.