I was contemplating the exact same wheels for a track day setup awhile back, and decided against the Raijins due to the following facts: The load ratings of the wheels are low for our cars, the bore of the wheel is not to OEM spec (Audi OEM wheel Hub Bore is 66.6mm-Raijins are 72.6mm) requiring wheel hub rings to properly align the wheels to the axle, and finally the fact that there are not allot of people who have used the wheels on our cars.
The bottom line is there are only a few wheel manufactures that make wheels specifically to fit properly on the S4 B8. The things mentioned above are not definitive barriers to the Raijin wheel, just that when you spend the money on a fine engineered car, it is good to use aftermarket components that will provide the same if not better performance characteristics as OEM.
I opted for the VMR 718s in 18x9.5 et +45, and I love them. The ride quality is better than my OEM 19x8.5 RS3 wheels and they are my track wheel

. I would not however, recommend the 18x9.5 wheel for anyone who may need to run chains or any thing else for than matter on the wheel tire assembly. Go with the 18x9 if you are looking for a wider than stock contact patch.
See this thread for more info
http://www.audizine.com/forum/showth...brake-line-kit
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