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Originally Posted by Perfectlap
Porsche's are Porsche's. Significant improvements will be very very expensive.
but the author of the article is being far too general and inacurate at times.
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I agree with you. Most cars will benefit from proper ECU tuning to fine tune the fueling and ignition map. Factory programs need to be engineered with a wide variety of drivers/conditions in mind. From careful owners like ourselves to people who just plainly ignore the maintenance of their cars, from low grade fuel to high quality fuel.
I don't subscribe to the stock-is-best way of thinking as you can see. Quality aftermarket parts like you said will enhance the vehicle in terms of performance, looks and re-sale value.
It's generally difficult to extract significant performance gains from NA cars. Try tuning a Civic/Integra Type R and you'll know what I mean. The cams, compression ratios, fuel and ignition have all been but optimised. But that doesn't mean it cannot be improved upon. There's still that couple of % that can be extracted from the car... Blueprinting the engine is a good way to start. Even the exhaust can be worked upon. Just stock to reputable tuners like Mugen for the Hondas....
On turbo cars, I beg to differ. A downpipe upgrade with a free flow exhaust will liberate 15bhp alone! A boost controller works wonders for driveability. The STi mentioned in the article probably has wrong springs fitted or with the damper setting all screwed.