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I believe the 987.2 and later 6 speeds bolt up with no problem and have a spot for the starter much like the 5 speed. They are supposedly stronger and lighter than the earlier 6 speeds. Of course those transmissions are $2500+ right now and demand is high for them. I could probably sell 10 of them if I had them. All the WRL guys want them.
Another motor I haven't heard much mention but is actually a better motor than the 2.7 and possibly 4.2 is the VW VR6. The VR6 is a beast once you throw a turbo on them. The rumor i heard was that the VR6 was designed to be a diesel motor originally but then was switched over to run gas. Because of it's diesel dna, the block, crank and rods are super strong and can handle lots of boost. I'm thinking it's height might be a problem in a boxster as it's almost an inline six. That could also be a good thing as there would be more room on the sides for turbo plumbing. A turbo'd VR6 is also one of the best sounding motors ever. The VR6 was the base motor for the cayenne.
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Woody
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