Quote:
Originally Posted by vskid3
My dad has looked into converting one of their vehicles to CNG over the last few years. Unfortunately, the EPA certified conversion kits are very expensive. There are many cheaper kits that are certified by international agencies, but they're technically illegal to use in a road vehicle in the US (offroad or racing are fine).
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As long as those non-certified cheaper kits retain a good safety level, you could manage the legal issues submitting the vehicle to a smog referee after the conversion.