i ordered some from a online store and i was wanting to know if any one has treid this or has anything they know about this
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i have got it allready however the oil filter one came broken ( they just threw it in the bag and mailed not in a box or anything and the post office mauled the bag it was in ) so i cant put the oil filter one on but the gas line one is on and i havent seen any mpg over one tank

does anyone know anything about these ?

yes i have the gut feeling got taken