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while carbon fiber heated from 2500 to 3000 °C (graphitizing) exhibits a higher modulus of elasticity
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I doubt highly doubt that such temperatures are ever seen in an exhaust system as, in general, combustion regimes try to avoid going over 1500C (2800F) to prevent NOx formation. I would imagine that temperatures after the CAT are below 1000C. It wouldn't be too hard to find this out for someone with a temperature probe and some time.
FWIW CF would probably be cheaper than Ti as Ti needs to be welded in a vacuum to avoid... I don't know. Its in
this article. Read it last night. If I remember it had to do with corrosion. So, from this standpoint, it would seem that CF would be significantly less labor and $ intensive to produce.
Aluminum exhausts seem to have mixed results. Some have had great results, others have reported deterioration due to sulfur in the exhaust stream (per some JDM forums).
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it would cost far more to do it with carbon fiber b/c 1) its never been done before (and so you'll have to spend quite a bit of $ on R&D, not just production)
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Where's the fun in spending $ on R&D when you can just build one and see if it works?
