Air box pop-off valve. Prevents air box damage from backfiring.

Fitted inside the standard air box, the pop-off valve, which is also called a backfire protection valve, is a good modification for 911's with the Continuous Injection System (CIS). In the event of a backfire, which is not uncommon with these cars, the pop-off valve will release the pressure which can crack and damage the airbox.

Drilling of the air box is required, instructions included.

- 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

To fit:
911 08/1973-07-1983 (vehicles fitted with CIS Continuous Injection System)