These adapters will enable you to use a standard 3″ hose with the stock bumper ducts. The outer diameter of includes a lip to keep the hose from sliding off when using a hose clamp. The transition is smoothly formed for better airflow into the hose. Made from impact resistant ABS plastic. Use with a backing plate from your favorite manufacturer.
These are press fit onto the ducts. You can choose to drill a hole and secure with a bolt or rivet for extra security.
Fits late model E30s with the plastic bumper.