If you own a CIS-injected 911 (any 911 produced from 1973.5-1983), the absolute most worthwhile purchase you can make for your car is an airbox pop-off valve. CIS-injected cars are notorious for blowing up their airboxes due to internal backfires. A blown airbox is a costly and time-consuming repair, and can be prevented by the simple installation of a pop-off valve. Check out this detailed, step-by-step technical article on performing this upgrade.
Pop-off valve, 1973.5-83 Brand: APA
$47.50
10-0843-000-M253
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