My toyota supra 1998 twin Turbo vvti suddenly developed a loud exhaust noise, anyone

[irishsupra]

The noise is coming from the area between the turbo outlet pipes and the waste-gate on the manifold, the sound is excessively loud, as if there was no exhaust on the car, but there is, and I checked for holes, and there aren't any, is it possible that then waste gate valve is jammed in the fully open position, the car is not down on power or turbo boost, is it a simple repair such as new spring on the waste gate valve? Any help would be appreciated thanks!