Wheels and tires for my Boxster
 

I have a 2000 Boxster. Will these wheels and tires fit?
Wheels are 18x8 - ET 50 - and 18x10 - ET55 - - oem quality made in the same Italian factory that made oem factory wheels . - a great option for your track day or autocross. P-Zero Tires are 235-40ZR18-95Y and 285-30ZR18-N4 Plus-3 sizing, with 24-inch running diameter .

The fronts will fit fine. Although, with that offset, you probably won't get the desired "stance" that you're probably hoping for . As far as the rears are concerned, they won't fit with a an offset that high; especially with a 285 tire. You'll need to lower the offset to at least +45 in order to obtain a good fitment .