How much power is a stock air filter worth?

[KTA]

So when I was at Firepunks I got to do some testing during dyno runs and I can say that the stock paper air filter was worth 4hp on a 430hp setup and the stock ribbed intercooled air intake hose was worth 1 hp. Not much for gains to be had there!

[cougar]

IIRC, quite a few years ago there was a big bru-ha-ha over air filter. I think because someone collapsed theirs spawning the Big Honking Filter debate. A lot of data was offered up back then. I chose to go with the BHF only because I live in a very dusty environment and not sucking a lot of air at the time. A bigger filter wouldn't clog up as fast. Now that I'm pushing 45psi into the head, I'm glad I did. Never been on a dyno so I don't know what hits the ground. My home-made cooler tubes was the last upgrade. It was more for EGT control than anything else, but I did notice a performance boost.

[spencerdiesel]

KTA that is great to know, do you know what variant of dyno that was? Dyno jet/ mustang etc?

[DMan1198]

It being firepunk I believe they have a dual Eddie dyno, which will give the most accurate numbers with a diesel.