Thanks for your response. I just purchased a set of Porsche rims fronts are 18x8 et 50 rears 18x10 et 65. I have a 99 Boxster base so I am planning on getting 25mm spacers for the rear and maybe 10mm for the front. figuring on 235x40x18 tires for the front and 275x35x18 for the rear. Based on what I have found on the web this should work. Do you have any thoughts?

Saw your name on another post regarding wheel spacers. I was looking at ECS because they sell kits with spacers and bolts. Do you have any insight regarding reasonably priced wheel spacers for boxsters?