QUOTE(BloodType89 @ Oct 6 2008, 07:55 PM)
Do you have an aftermarket intake or is it stock?
Most aftermarfet tubular intake stysems do have a slight whistle at like half throttle at kinda low RPM, but it only lasts for maybe 1 or 2 seconds.
By the way you should put that "spiral thingy" back in. (If it's actually a high quality one that is) the origonator of that concept, Tornado, is actually a good product not a rice sound emitter. I haven't had one, and I assume it probably does cause a bit more whistle, but it's also giving you about 3-5 extra MPG, and a few xtra ponies too.
Anyways, definately don't go rebuilding the motor, cuz you'll start it up and have the same thing still there.
Unless it's the intake like I mentioned, then it definately sounds like a Gasket, tube, or valve with a notable leak somewhere... did you check the EGR system?
Good luck!
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Dude those spiral things are the biggest rip-offs in the world. They do not add MPG or any extra HP. They are a waste of money.
And sometimes when I'm on the highway I hear a light whistling or cracking noise but it sounds like it's coming from my windshield around the seals or something. That could also be your problem.