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Just a quick opinion from a non X5/X6 owner.
If you have flames, you have unburned fuel making it all the way through the exhaust system.
Best case, there is combustion happening where it's not intended... heat & pressure will probably damage stuff over the long term.
Worst case, you have a fuel delivery problem that could be a serious safety concern.
Or... Your car was madden... Are you SURE you still have catalytic converter(s)???
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