You might want to check what class you will be running in if you change your wheel size. I think you maybe able to stuff the biggest tire you can onto the stock rims but changing the wheel size usually throws you into a different class.
I think the Z is now in CS...used to be in BS. I know BSP in Hawaii was insanely competitive.
Since you're just starting off in Auto-x I would recommend staying stock for at least one whole season just to see where the limits of the car and your driving skills are at.
Other than that have fun!
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