18's look kinda too pimp IMO .. i'd stop at the 17 mark for a FWD.
Oscar

 

they do a pretty good job with keeping up with tirerack.

 

pricewise they are very good, i agree. but the guys don't know much about imports. the service isn't great either.

 

I put 18" rims w/ 215/35R18 skins on my 2000. When the GPS is reading 70, the speed-o-meter is reading approximately 66.5 mph. However, it is not linear. The slower I go, the closer the difference becomes.

 

the calculation on that website shows there shouldn't be that much of difference. the radius of 215/35/18 is very close to the stock 205/50/16. furthermore, it should be linear, as a ratio by multiplication. our 18's should be slightly smaller than the stock 16's. so the speedometer would read a little faster than your actual speed. how come?