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F3/4 series cars tire diameters are 26" with the exception of F34 (GT) which is 27". that is why your wheel gaps are so big. is your car an x-drive also?
at minimum you should be using the OEM staggered tire sizes for a F34 GT. 225/40/20, 255/35/20, 27.1"/27.0" a profile size up in aspect ratio from what you currently have.
if you are not x-drive you there's a few other tire size combinations you can consider but i'd go with what's above to keep it simple.
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