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Its 217hp vs. 200hp which you may or may not feel, after 4 years not likely. The 3.2 has a thicker roof, but the standard roof is just fine really. All the same failures that the 2.5 has the 2.7 also has (and the 3.2 for that matter) so your in the same boat. Theres a small chance you could have RMS and pretty well no chance of an engine failure now after covering that many miles. It would have shown up by now.
I would change the oil anyway just as a matter of precaution. Check the air pressure in all your tires, and look at the insides of the rear tires for wear. The most common sign of wear on the rear of the boxster tires is sawbladeing which means the blocks on the rear are worn on every other block. So one high one low one high one low etc etc.. Thats normal wear from lots of negative camber on the rear of the car. It will make the tires more noisy than usual. If you hear lots of tire noise chances are you need some new tires.
Enjoy.
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