Hey tight!!
None of the 5 speeds will last. Sorry  You need to go to at least the 987 BoxsterS tranny (it has shorter ratio's than the CaymanS 6speed)
We blow up 5 speeds in the 194rwhp Boxsters.. 
I ran upwards of 340hp through *your* 5 speed for awhile. We broke it.
Texas? and NorCal?
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