hi, i just bought a kn airfilter for my 2001 explorer sport trac, under acceleration, it makes a high pitched whining noise, similar to a turbo, i'm wondering if this is normal? and at about 3500 rpms, it gives a nice throaty rumble to the v6. is this what the performance filter is supposed to do?
they do move air more freely than an OEM air filter less restrition you might even notice improved gas mileage
this means it supposed to b makin those whining and rumbling? it sounds great to me, i was shocked, but there was that part of me that said its too good to be true, but i guess not? lol thanks