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KILLSHOTS · 05-09-2014

I think my theory on the C4 in general has always been that the bottleneck is the filter itself, not the lid. In essence, open the lid more and the air still gets held up at the filter itself. Since we can't really increase the flow through the filter (a K&N doesn't flow better than a clean stock filter, for instance) I question whether we really increase airflow by a worthwhile margin by going from a vented lid to a full-open lid. That said, I'm totally open to being shown otherwise and I would definitely switch to an open lid for a few HP and better breathing characteristics overall.

Has anybody ever noticed a difference in intake noise when switching from stock to open? Maybe that would indicate a difference in airflow.

05-09-2014	#8
KILLSHOTS Join Date: Feb 2014 Location: AZ Posts: 857	Re: Open lid? I think my theory on the C4 in general has always been that the bottleneck is the filter itself, not the lid. In essence, open the lid more and the air still gets held up at the filter itself. Since we can't really increase the flow through the filter (a K&N doesn't flow better than a clean stock filter, for instance) I question whether we really increase airflow by a worthwhile margin by going from a vented lid to a full-open lid. That said, I'm totally open to being shown otherwise and I would definitely switch to an open lid for a few HP and better breathing characteristics overall. Has anybody ever noticed a difference in intake noise when switching from stock to open? Maybe that would indicate a difference in airflow.