Oh my! I haven't had my boxster but two months (70K miles) and I'm in to it for:
DD Din installation kit - $165
Console Cupholder - $55
Red Clip - $6
Logo - $51
PST2 - $320
Mats & Rear Speaker parts - $330
Kenwood DNX9980 HD & iPod Adapter - $850
Infinity Speakers - $350
Kicker Subwoofer - $125
Helix Blue Five amplifier & wiring - 650
Rear Camaera - $125
Ashtray Delete - $29
Center Radiator parts - $375
Bird Console - $335
Litronic Headlights - $740
Miscellaneous Pelican Parts - $350
Rear Tires - $350
Alignment - $100
Total ~ 3200
And I still have:
Remaining parts for center radiator & flush - $450
Water Pump -
Low Temp Thermastat -
Belt -
Oil Change - $125
Filters -
By the time summer hits I'll have put $4,000 in to it if not more, but I have to admit it is a blast and well worth it. So far anyway.