While browsing ebay.. looking for a deal on tail lights and side skirts.. I found "Boxster OBD Performance chip"
http://shop.ebay.com/?_from=R40&_trksid=p3907.m570.l1313&_nkw=boxster+chip&_sacat=See-All-Categories
Price varied from 20$ to 130$
They claim 10-20 HP improvement and better mileage. Also you don't have to flush your ECU
Is it real? does it work? what are the downsides?
Can anyone please shed some light?
Thanks
Sasha