PORSCHE 997 BLOW BYCan't find what you need? Try browsing the Accessories or Exploded Diagrams!Filtered by: 911 1965-69 - Engine (includes uncategorized and accessory items) 911110904WO Prevent costly air box explosions! Porsche 911 engines from 1973 on have had the bad habit of backfiring upon cold-starting. And blowing a hole in the air box. When this pop valve is installed in the air box and a backfire occurs, the valve will instantly open and release the backfire pressure. Afterwards, the pop valve then automatically closes and the engine continues to run. The air box pop valve conforms to all emission regulations and has no effect on performance or gas mileage. General Fitment911 1974-77930 1975-77 911 1978-83 911 1970-73 911 1965-69
$28.50
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