Lucas Motorcycle Octane Booster - a real octane booster! Tested and proven to deliver three times more boost than most other brands. It's safe for turbos, oxygen sensors and catalytic converters. Stops knocks and raises MPG in high compression engines. Safe for any gasoline engine. Safe for turbos, oxygen sensors and catalytic converters. Suitable for use in fuel injected and carbureted engines. Provides more boost than most other brands. Promotes clean fuel burn for fewer emissions. Notes: Recommended for 4-stroke engines ONLY; do not use in 2-stroke engines. Not street legal.