I see 3 or 4 different fuel saving/power increasing devices on ebay like some chip thing you plug in says 5% gain in HP and a magnetic thing you put around the fuel line near the fuel rail in your car and the spinning thing you put inside your induction after your air filter all say increase HP and decrease fuel consumtion does anyone think with all these thing together will work or is it a scam 90% of the coments on ebay say there do work and 10% said that it dosen’t anyone know the truth about these products on ebay

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