I just noticed this noise, I knew before it would only come on at wot, but lately I’ve been hearing it of the line at about 2.5k and up.. it sounds like the car is whistling.. but I don’t feel any lack of performance.. is something leaking.. is this a normal noise, which I didn’t hear before.. or do I need to start inspecting for a leak.. and what should I look for?
Kinda sounds like a quiet supercharger.. lol.

 

Ahhhhhh!!!!!!!!!!! I've got the same thing and seems to be worse in summer. The whistling seems to be coming thru my HKS intake and has been doing this for years. Do you have an intake? I'm assuming what we are hearing is some sort of emissions vacuum under part throttle. When I had my Poorman's CAI with the stock airbox on, my car didn't whistle. I don't think we have anything to worry about.


Dave

 

It's common with CAI.

 

My car was whistling when I had the stock airbox. The whistling came from around the intake manifold. It's nothing to worry about, since I know cars that have this sound is pretty cool indeed (and usually have a up-to-date maintenance).

However, when I put Frankencar's intake and Stillen kit, now I have two whistling noise, one that goes "sssssssss", which is from the air intake and the original one that goes "eeeeeee...." from the intake manifold.

The "ssss" thing is kinda cool...it's like having a very, very low pressure turbo....