You will not gain any performance through a CAI, exhaust, etc..as a matter of fact you will probably lose performance
An ECU tune will tweak the drive-ability fun, but for the cost will not add any significant speed at the track.
Best performance upgrades I have done besides seat time at the track, PSS9's and some R-comp tires for the track. But if you do upgrade to R-comp tires I would definitely invest in an X51 oil pan as the extra g's can produce oil starvation
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2001 Boxster S
RUF front bumper, Techart side skirts, Gemballa rear bumper, PSS9s, Cargraphic 18" racing wheels, RUF exhaust, GT3 seats
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