Interesting the Delco had the lowest pressure. But with those pressures being 2x normal pressure, would the difference be greater or lesser at 40psi?
And whats the best air filter?
less volume flowing thru, less pressure lose but as shown in the test rig at the youtube videos. any normal filter is in bypass by 70psi worth of flow and isn't doing crap. so I would bet that pressure difference is in how well the bypass valve is designed. they really should have shown the pressure gauge before and after the filter along with the psi at 10,20,30,40 ect. so you can see the pressure drop.. engine masters is a motortrend TV shill show I believe. just like all the old magazines we grew up reading. they got parts for free if they could come up with test combos that would show them in a good lights. which is why they always pushed low flowing low rpm. tq cylinder heads, till the ls came out and proved hp at high rpm is faster and requires head flow. a stock 1997 ls1 cylinder head flows more than the aftermarket Edelbrock sbc heads hotrod mag pushed on everyone for years. truth is everything Edelbrock sold was middle of the road as best.
ugh rant/ haha.
my opinion based on very little, best air filter for dry, not k&n oiled, high flow but still good filtering dry is the Donaldson power core ones..
used in industrial setting and gm used them on the 500hp ls7. to me it's best trade off. k&n might flow better, but you're relying on the oil to filter, which does seem to work thou. there's no air straighten effect with most filters that these new card style gm maf sensors seem to need.