I think 33 is correct. The original tyre pressure should be written on a white label with green writing, its on inside drivers side door frame. The pressure specified will be (for Japanese imports like the GT-T) in bar so you need to convert bar to psi. This gives 33, if you lower the profile you may need to adjust the pressure slightly higher -
Also be aware you speedo will be slightly out on bigger rims) so you should be very careful about speeding as you may be going faster than you think!
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