Whistle?

[gonzo1615]

OK, when my engine reaches about 4K rpm there is a loud whistle. It sounds like a whistle made from air going thru a pipe.?? I have a kkm intake, but it is just recently that the whistle started. Waterpump?? Any takers?

[Tony2005]

"kkm intake". Remove and put in stock and you can confirm.

[JEFFtourCT]

i have the KKM also.. i hear the whistle.. its cool i like it.. haha. i think it might be from the fender well connection...

[gonzo1615]

Thanks guys!!

[getsum111]

My brother put a throttle body spacer on his F-150 that causes a whistling sound also. Agree it's prob. the KKM.