Best chance of a precise answer to that question is at http://www.jaguarforums.com/forum/xk8-xkr-17/
Helpful people, and they can answer EVERY Jag question, every model. Join, read the "New Member" instructions, and ask away.
If i were to guess, I would venture it to be a clogged cat convertor. Great instructions on that forum on how to service one by soaking it in citric acid (vitamin "C'). Works better than replacing with aftermarket unit.
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