i'm looking at getting a pair of the work cr kai's ,,, but i want them to look like they have some depth to them. will a 18x8.5" rim fit on a 05' RS. i'm figuring that the offset is going to be somewhere between 47-50. does anyone know the answer to this ? ... thanks.

 

I don't know if the fenders are smaller for the RS, but this setup should work with a WRX
high offsets are good.
just to give you an idea i ran a 18x8 +51 on 225/40/18 and i had no problems at all.

 

Actually you might have a little problem w/ the 8.5" width in the rear.