Ok, so I have been researching the wheel and tire options for the V3 CTS-V. The below chart was one that I found that shows the OE specs:
Wheel: 9.5x19 ET23
Tire: 265/35ZR19 (94Y)
Wheel: 10x19 ET39
Tire: 295/30ZR19 100Y
This also shows 2 other specs; one of which is 10x20 ET20 and 11x20 ET30… would this setup actually work or would this be destroying the inner fenders?