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Porsche 911® engines since 1973 have had the bad habit of backfiring and blowing a hole in the air box. 911® Pop Valve is installed inside the air box and when a backfire occurs the valve will instantly open and release the backfire pressure. The Pop Valve then automatically closes and the engine continues to run. The 911® Pop Valve conforms to all emission regulations and has no effect on performance or gas mileage. CIS Injection Only
Was: $39.99 Kit
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