Mucho good stuff has been said already. My 2 cents:

  • S4 or S5 will work.
  • Starting with a 5-lug S5 makes life easy.
  • Some folks think a sunroof car is a hair stiffer due to the additional structure up top. And no-sunroof cars are hard to find. I wouldn't worry about it either way.
  • Yes on the 5:12, yes they are pricey.
  • The S5 nose is slightly aero-superior.

Email my partner Nick Leverone for much, much more info - I just drive one, he builds 'em!

Steve Ulfelder
Flatout Motorsports
05 ITS
www.flatout-motorsports.com