In this video I put my Truck on the Dyno to find out if after market air filter improve HP.

Truck running 87 octane regular fuel. I did not use K&N filter because I personally don't want to use Oiled Filters. This is a personal preference.

We can see that having the hood open and hood closed does not really change the results significantly enough to skew results for all but the aFe takeda intake system. So personally I don't think its a big issue to run with hood closed or open on the Dyno. Realistically the hood open probably is more realistic because you have many nooks and crannies that air can come in from at much higher volume compared when driving outside. I think It would be more closer to real life because the fans cannot fully replicate the air flow that would be experienced under real driving conditions.

Amazon Links:
AEM Drop In Filter: https://amzn.to/3qkoSUr
AEM Performance Intake: https://amzn.to/3fWoIxU
aFe Takeda intake: https://amzn.to/3ln7FpH
OEM Air Filter: https://amzn.to/36KU8mD

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Big thanks to Dylan from Countersteer for helping with this video!

Thanks for watching!