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not sure if you'll see any gains on a stock tune, but I did use it with the jb4 and saw some gains. while it wasn't as much as straight 100 octane, it was somewhat close. this was measured on a drag strip Where with 100 octane I pulled 12.5 and with torco I pulled a 12.7. straight 91 octane with map 1 got me a 12.9
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