Appropriate Wheel Offset for 18" Wheels?

MuuMuu101 said

I don't know all the details and the last time I saw it, it was running 265's all around. From what I understood, a pneumatic cylinder was used to push out the lips even further. As far as I remember, nothing was done to the inner housing, granted I saw this car 6 months ago.

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Samy is correct, no mods to the inner fenders. Hotchkis TVS, 1.06 Tb, slightly crooked Borgeson box, rear springs in stock locations. All the mods to increase tire clearance are to the outer fenders. Pneumatic tool pushing outer out about 1.5 inches in front, then some massaging of the front wheelhouse lower corners. 18x10 front wheels with 285/35 tires.
Rear fenders relief cut and then pushed out a lot, I have 14 inches between fender lip and springs. 305/30/19 on 10.5 inch wheels fit perfectly, 1 inch from springs, 3/4 inch from lips...