I think my turbo is goin bad, when i cut the truck off i listened to it and i can hear the turbo fins turning as they stop spooling. its not really loud but you can hear it without opening the hood. it sounds like they are hitting a little metal. i always let the truck idle for a while before i cut it off. does this mean its getting ready to go? if so what would be a good upgrade for my truck turbo wise. i still want to put injectors and head stud in it at the same time. what injectors should i use?