saving petrol-Magic Jet

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i just bought a magic jet.is amazing.the speed improved and saving me up to 15% fuel.i would like to u all.it recomend by my friend at one stop-Option car shoppe,i promised him will promote this product if is good.beside,i survey the price,almost people sell Rm188 but the guy offer for Rm158.if anybody interested can went to have a look.