I have an induction kit, hks wich is fine but when i fitted a pipe that replaces the resonator i only get 0.6 or 0.7 bar of boost, i can hear lots of suckin from the filter on idle plus the wastegate is even louder now. Have put the resonator back in an boost back to 0.9. Any idea anyone?

I have a 93 wrx import

 

any1?