In line octane boost

[beavy69]

Has anyone ever used one of those in line fuel octane booster units?

what are they like compared to say NOS race formula/lucas stuff you pour into the tank?

[Stuart]

cant see them giving any visible gains really. a tune up at a RR would be a more beneficial spend

[jbowman]

You wont find a big difference - they only tend to be used on Jap import cars that need 100+ octane points. Its would make the car run better though.
Jus the same as putting in the liquid NoS stuff in your fuel tank.