How can I determine whether an alternative fuel conversion system or other aftermarket device claiming to improve fuel economy or reduce emissions has been appropriately certified or verified?
The best way to ensure an aftermarket system or device is legitimate is to first confirm that it has been properly vetted by the U.S. Environmental Protection Agency (EPA) and any applicable state authority, such as the California Air Resources Board (CARB). There are a number of ways to do this, as described below.
Certified Conversion Systems
Always request documentation! Conversion system manufacturers should be more than willing to provide a copy of their EPA-issued Certificate of Conformity
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