Conversion Shops

In the past I did not think much of 3rd party CNG conversions (non-factory), but have since changed by view after conversing with other CNG owners and converters. I would recommend weighing cost, warranty, knowledge of installer/maintainer, availability of parts, etc. with a factory vs. 3rd party conversion. Whatever you do, make sure all shops are trained/certified to install and maintain a CNG system and that kits are EPA/CARB certified. (Some states will not pass emissions for non-certified kits and others will not honor tax credits - but the big one is the EPA that can fine you $5,000 per day for using a non-certified kit.) A CNG system inappropriately installed could be dangerous (... as could a gasoline system).