Now if you want a power-boxster, I recommend engine swapping. Plenty of neglected 986's out there, some in need of new engines. The value of these cars is solely based on the condition of the engines.
Precision Chassis Works has done a few EJ25 swaps.
http://www.precisionchassisworks.com...onversion.html
He is expensive, I think he said he can swap a car for a customer for ~$20k. I personally hate the EJ25.
http://986forum.com/forums/general-d...-interest.html

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Now the much better plan is his latest efforts...
Thats right, 4.2 baby!
Boxster's two transmission are the Audi/VW 012 FWD 5spd Transaxle and the 01E 6spd Tranaxle. These units share the same bell housing pattern as all the Longitudinal VW/Audi engines. The 2.7TT, 1.8T, 2.8 V6, 4.2 V8 etc.
Another example:
The 4.2 came in several forms. Most common will be the vanilla A6 and A8 engines. They all make around 300hp. Newer engines and specialty engines (RS6/RS8) make more power but cost considerably more. A 32v 295hp 4.2 is ~$500.
So you'll save some coin by skipping the adapter plate / clutch+flywheel issues. You'll get a cheap powerful engine and my god the noises it makes...
So my plan at this time is sell my running 2.5l for $2,500 - $3,000. Buy a 4.2l for $500, clean it up for another $500, megasquirt, long tubes... oh yeah... poor mans R8