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friend addint this in at a rate of 1 to 20. He seems to be running a lot better. He's claimed to tune an extra 23hp with the additive. I've heard that Xylene has high octane properties but haven't heard anything specific, as far as actual octane numbers. I was suspecting around the neighborhood of 107 or so, but I've heard others saying it's more in the area of 133. What would be an ideal/recommended mix per 10 gallons? Also, I've heard tha Xylene although making a great additive, it can also have a sooty burn to it. This would only affect the precats and exhaust. Any insight on this would also be a help. Thanks in advance folks.
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