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If you want to change the look or if you want to run a tire that you can't run on your OEM wheels (like 245s or 255s), then new wheels may be worth the money to you. If you're happy with the OEM look and you don't plan on running more than a 225 tire, then there's no real reason to buy new wheels. The only reason you would need 18's is if you were running a 345mm or bigger brake kit, which most people don't. You can definitely get 18's that weigh less than OEM, but you can also get 17s that weigh much less than OEM. You sacrifice a bit of sidewall going to 18's, which means sacrificing a bit of ride comfort. But you'll sacrifice ride comfort anyways when going to MPSS, because their sidewall is very stiff.
In the end, if you don't have a physical need for 18's such as bigger brakes, it's entirely subjective to what you want and what you think looks good.
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