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I have been eyeballing those GWGs in 20"... Our stock wheels have a 48mm offset so with those being a +40 this will help with potential clearance issues. I would say to put a 245/45-18 size tire over the stock size 235/50-18 to make full use of the wheel and the upgrade. If you need more room a 5mm spacer will push you out to +35 and should be right there at the fender lips. Definitely don't want to go beyond that.

Edit - Make sure you buy the install kit with the hub rings. You will need the rings to prevent vibrations. I believe the hub measurement on our cars are 70.3 and those wheels are slightly bigger. The rings will make up that difference and keep the wheel "centered" to the hub.
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