you can play with the offset calculator at 1010tires.com
I know for sure that 9.5 +46 comes close to the inner limits with 275s, with 295s, I rub the control arm and require a 5mm spacer. That would make them a 9.5 +41, which has the same inner clearance as a 10.5 +33, so I would go no higher than that.
martin, you definitely want to raise it. Mine was too low and I destroyed the bottom of my first stillen bumper and had to replace it, and then my Zspeed undertray was hitting the ground and sparking in the braking zones, so I was getting black flagged.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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