You should see if the 2nd compression ring from the std piston fits in the groove of the XFi's piston. Don't even have to install it, just measure the ring thickness.
If it does, I'd personally have no problem ordering a set of total seal rings and only using the 2nd compression ring. I've never left piston rings off a piston in an engine before, but that's no reason not to start, right?
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