I just went through this looking for some 18's I actuallg liked on my ride. Your width is ok but 20's would make your side walls so small to fit that almost any bump could destroy your wheel. In addition, the hub bore on any 20 will be larger than the 70.3 on our cars so hub centric rings would be necessary. 18's look good on the body but dwarf the brakes. 17's are a good compromise anf theh give you the clearance for brake upgrades if you so choose.
Just my 2 cents
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