before I purchased my boxster i also was looking at getting a rx-7, 255hp in such a light car they really move but... they all seem to have cooling issues and the rotary engines as nice as they are drink gas like theres no tommorow. It also seemed when I was looking for one that even low mileage ones had already had rebuilds again as mentioned eariler apex seals crack due to over heating usually (very unreliable vehicles). If you are going to go through with doing this i would recomend you thow in an extra rad and if you are going for the twinturbo cooling will be even more of an issue.
even with all these concerns I would love to see this swap done the rotaries love the revs and sound soo nice (not to say the boxster dosent) but that would deffinatly be one unique porsche 
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1999 boxster yellow
mechanical-
evo intake, chip, desnorkled, boxster s exhaust & brakes, lowered w/ eibach & M030 combo
cosmetic-
gt2 bumper w/evo lip, TA side skirts, factory yellow painted interior, 18" turbo twists wrapped in AVS sports, 6 pack mp3
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