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I bought a 15 wrx that already had an AEM Intake already installed. I installed a AEM charge pipe on car not long after buying it I have yet to run across a check engine light. I was just wondering is it safe to say that the previous owner already tuned car? Is there anyway to tell I don't want to buy a cobb tuner and put stage 1 tune on it and it has already been tuned by previous owner.
 

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I would take it to a performance shop.

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