Ok. so i have a opened exhaust (dp, hfc, cat bak) with a k&N element in a modified stock air box. I only get .3 bar (4-5psi) on the first turbo and only .45 bar (5-6.5psi) on the 2nd turbo. I checked the actuators and turbo controls and any other vacuum line i could possibly get to. Could it be something else besides a popped off or cracked vacuum line? I really need your professional advice. thnx

 

its most likely a small hole in a coupler. Check the one that connects the crossover tube to the y pipe. Then check the 2 intercooler hoses. You have to take that stuff out to inspect it correctly because the hole may only show up when boosting when everything expands. If it isnt that you need to start checking vacuum lines. Then lastly a solenoid or actuator may have gone bad. Thats all it can be I doubt your turbos are bad especially if this just started happening all of the sudden. I havent seen an actuator or solenoid just fail but its possible...Id guess that its just air escaping from somewhere or hose came off. Be careful touching those hoses to the solenoids boy are the nipples on there sensitive