Jimbo, borla exhaust seems to be the choice amongst XF owners.
Also, many people have removed the resonators and put in
a 'Y' pipe. Look for threads. Try to make the hook up.
Per Connie, we are coming up your way. I guess you could
come down to valley, cruise up through Supieror and Globe.
Head out to Roosevelt Lake, then head back north, as we
go south. They are a blast.