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just FYI, the computer in the XFi has a slightly different fuel map, the pistons in the XFi have only 2 rings and the top ring is gapless, but both those differences are really minor compared to the transmission ratio and cam (built in 6° advance).
As said above you can simulate the ratio change(if your car came with 12" wheels) by going to 155/80R13 wheels/tires, and an economy camshaft from 3tech or delta cam with a +6 gear from 3tech will simulate the XFi cam.
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