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Noticeable difference = Placebo Effect!
These additives raise the octane rating only a few tenths of a point.
To get any real gains, you need 10-20% by volume which equals 1-2 gallons of the stuff on a Boxster, and then, you'd only see a mild effect on performance.
On the other hand, these things are powerful solvents and will reek havoc with your engine oil's additive pkg. necessitating more frequent, expensive, oil changes.
Long term they will negatively effect the fuel system components - fuel lines, connectors, plastic sending units, etc.
Save your money... they're not really worth it.
Cheers!
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