Hi Wally,
If its standard pvc drainpipe then be aware it will start to soften at relatively low temperatures, generally around 60degC + at which point they will lose their structural integrity. I would guess the engine bay could easily get to those temps on a hot day, standing at idle after a hot run. It is quite common for turbos in the heat of battle to glow red hot so there is bound to be excess heat floating around. I would think that a stainless tube was the best material as stainless does not transfer heat comparitively that well. The luxury material would of course be CF!
Clive
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