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Originally Posted by sasha055
Is it real? does it work? what are the downsides?
Can anyone please shed some light?
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Sasha,
The proper and best way to tune a Porsche is to get a good ECU re-map done by a tuner. Then, yes the ECU has to be reflashed and the cost will be up around $1,000. With a tune like this a professional is looking at the factory map and re-engineering the whole thing for better performance. It's kind of ground up re-engineering. So air/fuel/timing are all adjusted, giving a consistent, reliable (but also moderate) boost in power.
The cheap options you found on eBay are quite different. Welcome to the world of Honda tuning...  They don't re-engineer the ECU map. Instead they trick different sensors in the car into feeding erroneous information to the ECU with the hope that the ECU will adjust to give you better performance. It's a mixed bag. Sometimes it might actually do something. Sometimes it might not. Could be bad for the car too (running too rich or too lean). Bottom line though is that you're throwing your money away on garbage like that. It's not a product that's really designed to give you consistent, improved performance.
Just my two cents...
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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