I've just fitted a silicone 90 degree elbow to replace what I assume was the original turbo hose.
The old one hadn't split or even delaminated, but I had noticed recently that I could actually see it swell a bit when the engine was revved. Actually it was easier to feel it swell than see it.
I can't feel any swelling with the new one.
I am waiting to see if it has actually made any difference to the performance. I have tried to take notice of acceleration and deceleration on a couple of sections of road on the way in to town, so I will be able to give a seat of the pants assessment next week.
My tip is that it will make no difference to the speed drop off on long hills and that if I try really hard I might be able to imagine an infinitesimal improvement in initial boost.
Anyway if the original lasted this long (150k), the silicone one should see me out.