My turbo had a Rogue downpipe on it for 6+ years without failure.

I think I only fitted the bottom bracket after a couple of years use.

My exhaust flexi was a lot less susceptable to engine tilt because the old braded one had been replaced with Flexible Gas Pipe

EG
http://www.westerntydens.co.uk/accessories.html 
where it says Flexible Exhaust tubing

It would concertina very easily.

I think any pipe subject to repeated push-pull has the potential to break.

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Just how many Greddy manifolds have been known to crack?