LC and axle breaks with a stock tune = warranty repair
LC and axle breaks with aftermarket tune = expensive repair at your expense, unless the tune is the Dinan one which comes with (theoretically) full warranty coverage.

That is the first broken axle I've heard about, though. They must be pretty stout to handle the stock power.

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2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red