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I would say no but why not get the car tuned? You will definitely be amazed what a good tuner can do for a stock EVO or one with minor bolt ons
 

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You may over boost, there has definitely been some instances where that has happened. I can't say for sure if you will or not though. A tune would be the way to go and can be had for decently cheap these days.
 

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I'm getting it tuned soon, but if I can safely run the HFC/exhaust in the meantime, I'd obviously like to.
Yes.

Just make sure your HFC has an anitfouler. Some HFC still cant scrub exhaust enough not to trigger the CEL.
 
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