Hey, recently installed a Berk Intake w/Apexi filter on my AE '01. Now there is a pronounced whistle when I press the throttle with a certain force. With light pressure, it's a hissing, then with moderate, a loud whistle, with full throttle, it goes away. I checked all the connections and bolts. Everything is tight as you could want. The largest vacuum hose seemed a little loose, and there are some other lines (from the original stock intake) wrapped in this plastic "accordian"-like material that has cracked. Could that be the source of problems? Could it be the filter itself maybe cracked?

 

Check your hose clamps, make sure they are secure. I had the same issue with my berk when I first installed it but after some adjustment it went away.

-Rich

 

The largest hose will fit all the way, but even with the clamp on I can still pull it off without a lot of effort. Do I need to get a new, tighter clamp?

 

it is normal. i removed the restrictive plate in my manifold and the whistling became even more pronoucned. most aftermarket intakes will produce the whistle.

 

The breather hose will be a little loose. I dont think it makes too much of a difference, if you want to get a smaller hose clamp to go around this and tighten it up, up to you!

 

This is normal.

 

The whistling is normal.

 

I had aftermarket intakes on 4th gen maximas that never whistled...why is it normal now, and where is it coming from? Is it "normal" just with a Berk intake?

 

i have a berk intake on a 200 auto and it has a very pronounced whistle, but when you get on it the whistle sound kinda cool.
one other thing, where can i get a new apexi air filter for the berk.

 

the whistle is the air flowing over the throttle body butterfly valve at certain degrees of open-ness. It's there with the factory intake too, but you can't hear it because of the baffled/chambered setup, which muffles it to basically nothing.

 

Speaking of the Berk intake. I'm going to hi-jack as I ask what is the part number for the apex'i filter?

 

The Titan also experiences this.