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I dont think they meant any car you use it on, you'll gain 4-10whp. If your car has lost up to 10whp due to dirty MAF, then it's not false advertisement after all There is a fine print somewhere. on the can.
when i bought my car my rpm went too low under 500 so im not getting enough electric i changed the battery and charging motor whatever and still at 500 rpm then i cleaned the TB and my car rpm go higher at 700-800 thats mean not giving u more hp but keeps ur car running better