Has anyone got any tuning tips for my MY99 Almera GTi ?

Also, doing a track day soon and would like to hear from anyone who has used octane booster. Does it have any long term detremental effects on the engine ? If recommended which is the best and where can I get some ?

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If it's the same srde20 engine as in the sunny gti(which I think it is)then it's pretty tunable-usual filter/exhaust/cam mods for 20ish bhp gain.I know someone who has had a lot of engine work done on his srde20 and it's over 200bhp and very quick.
As for octane booster,I don't think you really need it as your car is already set up for UK fuel so no noticable benefit to be gained from raisng the octane.