[Dean]

Again, I am with Scott. Even if it was thin wall rubber or even inner tube thin, that short section of hose properly sealed and clamped tight at both ends is unlikely to deflect enough to do much of anything to engine performance.

There are lots of narrower points pre turbo that constrict flow more than that could. Unless you can put your hands around it and squish it to the size of the turbo inlet or smaller without pulling loose, I don't see how it could be the culprit, but what do I know?