hey guys, i've got about 600 miles on the truck and i totally love it. this is my first diesel that i've owned, i drive larger diesels everyday international dt466, that will rattle your head but i have never heard this noise. its only audible when part throttle and before the turbo really spools up. it sounds like a chirping-tweeting noise and i'm pretty sure its the turbo or realated parts. i heard it today cruising on the highway when i'm on the pedal slightly and until it starts to spool. its also audible when driving on the street but not at idle or deceleration. i'm not sure if this is normal as i'm new to the duramax. if anyone would know its you guys. i havent had really any other problems except the tranny is hard to shift out of park, and i noticed the tsb on that. any help would be appreciated. the truck is 100% stock right now. thanks for your time.