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Originally Posted by Adam
Agree, but sometimes the factory purposely holds a car back. The boxster S could've had 280 hp from the get go instead of 250hp but Porsche wanted to bump up the power of the 996 first. The car got a 30 hp bump and they didn't even need to up the displacement. That tells me some of these engines have some untapped potential.
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It may not (and probably isn't) tappable without changes to cam timing (as the later engines have with lift), port, cylinder and head design and all kinds of external engine stuff as well. Expecting the simple intake, exhaust and chipping to make anything more than a modest increase in power (at the expense of tolerance to bad gas or excessive thrashing) isn't realistic.