Mine has been doing it since New out of the Box...........Sounds like a bunch of Marbles rattling in a Can

 

mine exactly same as yours bro, no problem with that so far

 

Yea like I said earlier mine has been doing it since I put it on out the box. From what everyone including vortech says its normal. Havent had a problem yet and the sound goes away with any increase in rpm. Been running it for over 6k miles no problems

 

i' ve noticed that the sound is still there under no load but higher rpm. if you guys would check for me. start your car and rev up the motor from the throttle body (hold it at a steady rpm) and see if you can still hear it.
thanks in advance
josh

 

when driving all i hear is the whistle.