Hey guys,
Whenever I am toward the top end of the tach i hear a loud hiss or 'psht' sound, almost like air pressure that is being blown off. When i shift the sound goes away. This only occurs usually in 1st and 2nd gear. It only happens sometimes, other times it is fine. Any ideas?

Travis
398k and still goin

 

I would think boost hose , clamps ect.

 

as stated above,check your intercooler boots for rips and check the clamps make sure they are tight,also make sure a boot hasn't slipped out from under a clamp,the iner fender will some times rub on boots