I think "octane boost" is 108 octane, a few dollars for a little bottle. It's much cheaper to mix 100 octane from Union 76. They have scattered stations with 100 octane pumps. You can call 1-800-345-0076 for info. Some people also use toluene as a cheap fuel booster. I'm mixing 1:8 which puts me at 92 octane ((91*8)+(100*1))/9=92. It's a pain but my non-intercooled supercharger needs it (10 psi). See
http://www.76.com/
Regards,
Barry