my 05 is stock except for the exhaust and air intake ive got 60k on it, sometimes if i shift around 2k rpms from 4th into 5th and from 5th into 6th gear i can hear a louder then normal "whooooossshh" of air and its only if im going up hill or pulling a load. is that normal it never used to do that

 

I have an 06 with an auto and I can here my turbo do the same thing. when I'm on it a little and then let off it will whooooosh. I think it's normal.