Acceleration Noise
 

When I accelerate instead of VROOM like normal, I hear a high whistle ( today was the first time and the sound is off and on ) from the left side. Like how a NYC Bus sounds as its going by, or like a spaceship "shoooo or fewooo or whatever, I hope you get my meaning. I just had the front axles and expansion tank changed by the dealer. An Indy told me that I needed front axles, a tie rod and front lower control arms. When I took her to the dealer, they suggested none of what the Indy said with the exception of the above mentioned. What could this crazy sound be?

Also what is covered under warranty, mine is up in August. I also have free maintenance and I need to do all I can do before the warranty and maintenance are up.