Ben g brads

Hi all. Ive got a classic impreza uk version. 1998. I have a blowing noise near the turbo and lost bhp. Its either the down pipe from turbo to manifold has a split (heat shielded) or the gaskets or seals on the turbo.? Back in the day ive restored cars ect. This scoobys the love of my life. I havent got a service manual My question is: are my best taking the engine out as theres little room to get down there ? Many thanks