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you can use toluene or xylene as octane booster. to get 91 octane in your boxster, add 9.6 liters of toluene or 8.6 liters of xylene to each tank of fuel. to reach 93 octane, use 14.3 liters toluene or 12.9 liters of xylene. in the US, these chemicals are available from paint supply stores or home supply stores like home depot. you might even be able to order a big drum of toluene or xylene to save $$$.
exhaust, intake, etc. will help a little bit, but your car just isn't designed to run on the type of spark advance that 87 octane fuel allows.
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