engine swap 3.4 or bigger 10k + - 100+hp gain
Turbo 10k + - 100+ hp gain
Underdrive pulley 150$ - 10 hp gain
IPD Plenum 900$ - 24hp midrange and 5hp on top
Headers and high flow cats 2k - 8-10hp gain
ecu tuning will move your power band around for 1k. if you go this route for a good tune call pedrosgarage.com There the best for boxsters right now.
My .02 
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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