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Because those parts require engine management (EM)- especially on an 04+ due to the OL/CL fueling delay and other issues. Now, if you don't have EM, there's your problem. If you do, it may be that the tune is off.

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Q: Why would your Subaru Impreza gain low end power but lose boost during high speed driving after installing headers uppipe on your 04 WRX?
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