the most I know of that tranny holding is mid 450's... but that's the most HP anyone can get in a 986... I don't want to say that 450-700 isn't possible (well definitely the top of that range), especially when you are starting with a 3.6... but why try?
The boxster is a great with a n even better chassis... it could use some more torque, but the last thing it needs is 15 psi of boost. Just a little FYi... in a boxster, you are going to have to do a whole lot upgrading to get where you will be even be able to use any of that power... LSD, entire suspension, and etc... even then its going to be crazy hard to drive... just my 2 cents... my suggestion is get the 3.6 working in your 5.2.2 DME car will be a hard enough task, so start there... let alone rebuilding it the way you want... then worry about the tranny.
if you have any more questions let me know... I've been down this road...
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