turbo
 

can anyone help me out with this when im on boost goin up the rev range i notice my boost is droping to nothink what will be doin this thanks:D

RE: turbo
 

probably a vac leak...or the turbo is screwed, as I don't think you could leak as much air as the turbo creates while boosting.
I would check your gaskets and seals for the turbo and also look for any blow by. May be a good idea to have the intercooler pipes tested to see if they are holding pressure, if not then you have a broken pipe or seal.