My turbo had a Rogue downpipe on it for 6+ years without failure.
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I think I only fitted the bottom bracket after a couple of years use.
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My exhaust flexi was a lot less susceptable to engine tilt because the old braded one had been replaced with Flexible Gas Pipe
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EG
http://www.westerntydens.co.uk/accessories.html ![](./images/smilies/spacer.gif)
where it says Flexible Exhaust tubing
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It would concertina very easily.
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I think any pipe subject to repeated push-pull has the potential to break.
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.
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.
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Just how many Greddy manifolds have been known to crack?