Hello matey
As you know, i have 19" Kahn RSC-2 Split Rims on my baby, and they are (i think) a 9x19" at the front, and a 10x19" at the rear, i know they were special order from the normal sizes so as to fit the Supra. So i assume they are as near to proper offset as possible too.
When i bought my car, it had the wheels on, but the car wasnt lowered. And they dont scrub at all, not even on full lock, and they didnt scuff the arches.
I have since lowered the car on Tein NR Full setup all round, and the car sits very low over the wheels now, they still dont scrub on full lock or driving though, and they are VERY close to the arches at the rear, but the Teins are solid, and they dont hit or scuff at all. Pic below.
The Teins are on the 3rd setting down of 4 settings, and on the lowest, the wheels did just scuff the rear arches, slightly, but the car was ridiculously low.
No problems whatsoever though now mate, nothing at all. And no modifications needed to fit at all.