It's a falacy that more power requires bigger brakes.
More power will get you 0-60 faster, but the car is still going to stop in the same distance from 60 (or any other speed) as before. The Boxster brakes are some of the best in the business and are more than sufficient for any modding a DIYer would do short of doing a lot of track or auto-x work. People are either misinformed, or they simply like the peacock effect of larger brakes, drilled and slotted rotors, etc.
If you substantially increase the weight, say by 500 or more lbs. then bigger brakes may be in order to maintain the same stopping distance.
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