Review on Gumout 510022 Octane Booster by Rich Ferguson
Pretty good, works best in octane boosters
The 91 octane fuel I use in my supercharged 5.7 liter GTO has never been good enough to avoid engine knock under certain conditions. Gumout worked, but one bottle for a full tank wasn't enough. I had to bend it in half to completely eliminate the knock.
- Slim design
- Long delivery time
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