The 17" 986 Boxster diameter is 25" front and back and the stock front is 205/50/17. There isn't much room up front between the tire and the lower spring perch but maybe you could fit a 205/55/17 there? I don't know if going larger diameter front messes with the abs. I know going slightly larger in back does not. The front tires you mention all have a shorter sidewall and might roughen the ride vs the stock size.
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