I've seen H3R Halguard extinguishers used with great success. I have one in my daily driver and two in my "fun" car. They aren't cheap but they aren't ridiculously expensive either.

Standard disclaimer - No affiliation just a satisfied customer.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt