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				I don't think 16" wheels will work on the S..
			 
			 
			
		
		
		
			due to the larger brakes.  
17" wheels make great sense; !7" rubber is less expensive and more sizes are available. 
The stock 7" front and 8.5" rears  can be had for $500+ shipping. 8.5"s all around are probably the smart bet. Having said that, the stock sizes I mentioned above will be competative with 225/255 Victoracers.Next year I'm going to try 245/45/17 Victoracers all around on my stock widths rims, which I hear will work. 
 
At end, the $ looks like this: 
 
Stock 17" rims:     (e) $600 delivered 
 
17" Victoracers:    (e) $750 delivered and mounted 
 
So for roughly $1300-1400, you're ready to roll and have fun. 
 
BTW, a fellow in our clun runs a 2002 S with the stock rims and 225/255 Victoracers and comes in FOA with regularity. I'd also recommend going to an EVO school for auto-x  if you get a chance. You'll learn more in one day than a year or two on your own trying to figure it out.
		 
		
		
		
		
		
		
			
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				2013 Boxster S 
2006 Boxster--sold 
1999 Boxster--sold
			 
		
		
		
		
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