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More Power for Paseo98

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Hi to everybody :)
I'm a proud owner of a Paseo Plus 1998 in Italy.Wonderful car for my needs. Nice look, funny drive and good fuel economy.
I have read that the same engine of my Paseo 1998 in japan had 110hp with same fuel economy, but european version has only 93hp.
Is it possible to take again the same power without lose realibity or without lose fuel economy?
And what about "speedchip" that talk about +20HP with only 6 euro? Is it just a urban legend or maybe it give the original japanese eprom to engine electronic centraline?
Thank you to everyone who can help me, and sorry for my bad english.