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Homebrewed inlet funnel between K&N filter and Bosch 80mm HFM

HFM K&N filter funnel


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Homebrewed inlet funnel between K&N filter and Bosch 80mm HFM

This is a view inside my home made funnel connecting the 93mm-flanged K&N RC-3690 with the Bosch 80mm HFM. Remarkable fact is, there are noch steps inside, air is seamlessly forced from 93mm to 71mm which is the inner diameter of the HFM. Additionally the air goes in a straight line so the air flow inside the HFM is distributed very even. Very unrestrictive airflow.