What model is your eclipse? rs,gs,gs-t, or gsx? my gs made a noise around 4K RPM's when stock(now its turbo) and it was the transmission. My gsx also made a noise but its the turbo. the noise in the non turbo motors around 4K RPM's is present in almost all of them, especially when doing a medium rpm downshift.

 

Crapalier...LOL

 

she's an RS and not turbo...someone mentioned that it could be the turbo though...i mean it's not that i'm afraid something could blow up it's just really annoying.

 

huh?...u said its non turbo and then said its turbo?...which is it?

 

It's not turbo, i was asking a friend of mine and he said that it was the turbo, but as i just said, i don't have turbo, so that was out of the question.

 

I talked to my mechanic and your issue is simple. If you have an aftermerket intake you may have puller out the honeycomb disc that was in the original intake. That is designed to spin the air as it goes into the motor, if that is taken out then you will get a loud whistle. It is nothing to worry about if that is the case. Also check for foriegn objects on your filter.