ISB 300 Power loss / Turbo Failure

Most common power loss issues I would start with new fuel filters. After that check the exhaust manifold. I know the ISB is known to have a failure of either the exhaust manifold gasket or the exhaust manifold itself has cracked on a friends 2001 HR with the ISB.

I know I had siginificant power loss when I got a bad load of fuel that clogged up my filter, it had all sorts of codes but new filters fixed the issue. I saw power loss as well when the exhaust manifold gaskets started to leak, but thankfully the manifold had no cracked.