Air Filter or Not???

I run mine on. There was zero 1/4 mile difference, so I just leave it on.
 
I run the 18" AFE. I've tried it without, no differrence.

If you engine is over-fueled it may help, if it's not, it won't. But that's just a guess.
 
Seems like if it was that big of a restriction, it would crush the filter from vacuum?
 
I run without one...I chewed up 3-thrusts on a S300 from filter restrictions.

Took the 3rd time before I realized it....
 
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