I want to to buy some rims that were about 3 inches offset in the rear opposed to a factory wheels. I

have the front flipped and to make the back match or maybe a little wider i need about 3 inches. Then I

will have about an even ration.

does anyone have a setup like this?

 

you might need to go with extended hubs, wheel spacers, or some combination with offset rims. The safety of this is questionable though. You really need to go out and buy a new axle if you really need that much more width.