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I was surfing walmart the other day and found octane booster made by NOS!!! well, description says it bumps the rating up to 3.1 which is pretty good compared to other companies. I won't buy it anyways.. haha
Just buy a bottle of torco race fuel concentrate. I think it's around $20 for 48 ounce bottle. They have a chart of mixing ratio on their website. I used to use that with A4 2.0T 100 oct tune. I did feel a good difference.
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