You can’t just put a higher profile tire on, you will not have enough room for turning the wheels and may not have room for suspension travel ( car up and down movement ) Not sure what you mean by standard 18 inch tires. You need to talk to a good wheel shop and see if a smaller diameter wheel will fit your vehicle and what tires will give you the same diameter you have now. Frankly, it will be expensive and may not make that much difference.
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