Optimize your Porsche 911's engine with our Air Box Relief Valve, built for high performance and reliability. This valve enhances air intake efficiency and provides excellent engine protection. Trust our durable relief valve for superior operation. Compatible with 911 110 904 WO and 911110904WO.

Air Box Relief Valve for Porsche 911 (1973-83)

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  • $19.95
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Air Box Relief Valve for Porsche 911 (1973-83)

Don't blow a hole in your airbox! Older air cooled motors love to backfire on cold start. With a sticking cold start valve, the backfire pressure can just destroy the whole airbox. This valve instead will give your motor a safe way to get rid of the excess pressure, it opens, then snaps back closed, re-sealing the box. 

  • Guaranteed Fitment
  • 24 Month Unlimited Mileage Warranty
  • High Quality Materials
  • Replaces leaking OE air box pop-off valve that can reduce vacuum and degrade engine performance
  • Manufactured to original valve specifications for easy installation and reliable performance
  • Durable high-quality materials withstand high temperatures and rapid vacuum fluctuations

Replaces: 911 110 904 WO, 911110904WO