Choosing a 3.4 or a 3.6 has a lot to do with what MY you are driving. If I am not mistaken, the 3.6 requires a newer boxster due to the electronic throttle requirement. The 3.4 is a good fit for older boxsters like mine.
Richard's right though... I've investigated a 3.4 liter swap and it ain't cheap, new or used! Moreover, you can forget recouping your investment.
I'm still planning to do this or SC my 2.5.
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