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Wouldnt have thought so - just a lot more quality to the materials used, like if u upgrade phono leads on your hifi, u can get the crappy black standard ones with it, or u can upgrade them....
Would have thought the plugs just make it run more efficiently..
Performance leads and plugs make no difference whatsoever to performance or power. All you gain is reliability as the plugs/leads are likely to last longer.
Some people have experienced gains with fitting new plugs, but this is because the engine has been extensivley modified and requires a hotter/colder running plug from the standard one. This to me is not a real gain, as claiming back LOST power from a plug that is WRONG for the engine is not really a gain.