The biggest difference (usually) with aftermarket “cheap” wheels is weight. Overall, going to 18’s is going to increase that anyway, so going with a cheap wheel may make that even more so. Having said that, it really depends. Would you feel the weight difference? Maybe, but probably not. There will be some minor loss of acceleration, possible higher suspension and brake wear, but again, not outrageous. The wheels you are talking about are probably of similar weight to stock Boxster wheels. Check the weight, they are usually published.
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