My suspicion is that the Jag CDI is snake oil. Whenever anyone mentions "jaguar cdi" in the other forum, Fabian drools over it and "Jaguar" steps in to tout the "benefits" of his cdi.
Note that my username is "flashstar" there.
The CDI will certainly have an impact on an engine. The problem is no one has been able to show me that the stock CDI is sufficiently bad to warrant a $70 upgrade. Why not just decrease plug gap and increase jet size a bit to make things safer?
Unless one of the Jag CDI supporters can irrefutably tie accelerated engine wear to the stock CDI (versus the Jag), I continue to believe that this "upgrade" is snake oil.