Car: Integra LS turbo with stock internals running 10 psi off an Turbonetics kit. The car was tuned for 225whp give or take on 91 pump gas. Would there be any power gains by filling up 93 octane or higher? And do those octane boosters sold at the auto stores help any?

 

No, it should be about the same except it will run a tiny bit richer.

The only way your car will make more power is if it was tuned with the gas.

Just my educated guess.