I found the original NORMA PLAST TRS 15-8-15 reducing T's but I had a look at the spec sheet for NORMA T's and see they're only rated to 80 degrees for continuous operation.
That is a bit scary to me, considering it could have wrecked the engine.
That is a worry. I don't know about the Roadster but the Duratec Plus 4 runs at 90° to 95°C.
I have been thinking of fitting silicon hoses too.