Is there something called Intake Fuel Saver?

While i am browsing car parts on ebay i saw something called “Intake Fuel Saver Increase Gas Mileage +20 hp Go1 Green” which will save fuel with increase of engine performance and you can see it on the following links. is this thing real??? and if it is real, it will affect negatively on the engine??

http://cgi.ebay.com/ebaymotors/Performance-Air-Intake-Fuel-GAS-Saver-Increase-MPG-HP-/330615960826?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ASuzuki%7CModel%3AForenza&hash=item4cfa3f34fa

http://cgi.ebay.com/ebaymotors/Intake-Fuel-Saver-Increase-Gas-Mileage-20-hp-Go1-Green-/260852486330?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ASuzuki%7CModel%3AForenza&hash=item3cbc0510ba

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