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promax performance chip??

5638 Views 0 Replies 1 Participant Last post by  ml3addict
saw it on ebay, promax x chip its called or something...its a little resistor that u connect to your ecu--- says 30 hp or something like that even possiple to wire a resistor to your ecu and basically have an on/off button for performance/fuel economy?
confused on this and if it is legitimate
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