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Just a side note: the boxster engine has Lokasil lined cylinder walls which CANNOT be bored out
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Incorrect.
We have had extremely positive results with taking the stock 85.5mm 2.5 bore size and boring that to an 89mm using the technology we co-developed with LN Engineering.
We just finished a big bore 2.5 that made just over 200 RWHP with stock intake, stock exhaust and no ECU tuning at all.
The 2.5 is the first engine we began development of and the technology to perform a big bore solution for this engine is the oldest and most proven of all our developments. 89mm is the largest we can go with the technology, which produces a 2.7 when coupled to the stock 2.5 crank and 2.9 liters when coupled to the 78mm crank found in the 2.7. The 2.7 uses the same factory bore as the 2.5 @ 85.5mm, its basically a "stroker" 2.5 engine.
All that said, I have found that the 2.5 engine is the best developed from the factory as far as power is concerned, the UD pulley is about the only real power maker I have seen to date.
I refuse to compromise anything for performance, so I am not big on ECU tuning, exhaust implementation and etc. My direct experience with all of these has generally been a compromise of some other important aspect associated with drive-ability.
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