There was ringland issues because the STI run's too lean up top from the factory tune. Once you richen up the top end you have no issue. They also blow from people adding performance parts without a tune and leaning it out even more.
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2011 WRX STICobb Accessport, Nameless Performance exhaust, COBB SF Intake, COBB downpipe, 20% tint, Work Emotion XD9's
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