You need to lighten the car by about 150 lbs also to simulate an XFI. Changing the rings isn't THAT hard. Remove the head, remove the oil pan, pop the piston out the top and remove a ring, pop the piston it back in, reassemble. but but but, really not worth the effort IMHO. Just get an economy cam (or XFI cam) from Mike Covington at 3tech and and advanced timing sprocket (8*) and that would be pretty close. Talk to him and see what he can set up for you.
I have an economy cam and 8* sprocket in a box waiting to go in when I get the gumption to wrestle with it. I had a hard time takling off the old-style crank gear, so I just left it and used all the old stuff from the JDM. One day I'll convert to the newer square sprockets.
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