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Hi,
The main issue with the 2.5 is the lack of displacement, no easy cure for that. I question the HP gains mentioned, they are definitely optimistic. Even if they are accurate, it's much more important to compare the Power and Torque curves.
Re-Chipping and Flashing often change these to the point where the gains exist in an unusable part of the Curve, usually at the Top End (where you don't really spend much time at all). And, these gains are often accompanied by a corresponding drop in other parts of the curve, usually in the Mid-Ranges (where you will spend most of your time). This could result in a car which actually has less power for you to actually use. And, since you have less power in the Mid-Ranges, you'll need to give it more pedal than you did before in Day-to-Day driving which you'll feel at the Pump as your MPG takes a hit.
Finally, the gains on the 2.5 Boxster are so minimal (5%-10%, with 10% being VERY questionable), that it's debatable whether it's really worth the Time and Expense.
If you want a Boxster with more shoulders, you're probably better off in the Long Run Trading Up to the 2.7L or 3.2L. The cost of a Flash, Chip, and/or Exhaust would make a nice start toward this.
The 2.5 is what it is, namely the Original Design with Great Handling, Style and a cut above the Miata. Try to make it more, and you'll be sure to be making compromises, including with your Wallet. Of course, as usual, just my humble $0.02...
Happy Motoring!... Jim'99
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