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Originally Posted by oliverg
Can you / Should you decompress the engine before doing either procedure?
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Theoretically, you can lower the compression ratio by installing different pistons. However, I am not aware of anyone who makes / sells these for the Boxster. So, practically, the answer is, no...
Low boost levels with proper chip mapping should be fine without lowering the compression. I personally would start to get concerned at anything beyond 6psi or so, but that's not a hard-and-fast rule.
If you are seriously interested in forced induction, read Corky Bell's books - it's a small investment, and you'll be a much more educated buyer!
BTW, please do not think that I advocate the turbowerx kit over the iA one. An intercooled twin-turbo certainly sounds better to me on paper, but a lot depends on the kit maker's ability to tune the system, and I have no first hand experience with either of these kits.
Best,
Gary
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