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They have to follow the same regulations anyone else modifying vehicles has had to for the past few decades. All those aftermarket parts manufacturers have been going through this process for decades. Even if it adds a couple grand to the cost of a conversion, from the consumer's POV I think that having someone stand behind a ~10 year/150k mile warranty would be worth the extra cost in the eyes of most. The point isn't for installers to get rich, but for the vehicles to have the same warranty and the same emissions spec.
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