Appropriate Wheel Offset for 18" Wheels?

A quick photo from this weekends Autocross sporting 285/35/18 on 18x10 wheels front and rear...

NICE!!! :thumpbup:

So we know you did some bodywork on the rear quarters to make those fit, did you do anything to the front?

I have 275/35/18's on my Duster, but they're on 18x9's. I haven't had any issues on the fenders yet, but I still just touch the frame at full lock. But I also think the steering stops on my lower ball joints are smaller than some...