I know the answer.

["R. Wiratorn" <withu@loxinfo.co.th>]

                Hi
        
                Regarding to fitting A4 five-spoke wheel to the S4. I've
tested it
        by putting an out-of-duty scored front brake rotor of my S4 to the spare
        wheel of my A4. The answer is NO due to the weird brake rotor of the S4,
        the gap between the center of the rotor and the center of the wheel is 
        almost 1 cm.
                So I'll try S6 wheel.

                Have you heard of BBS RSII ? I've heard that it is 3 times
stronger
        and 20% lighter than conventional alloy wheel, is this true ? Acutally
        I love to have 17" rims on my car, but I sick of repairing them once
a year.

                                                                            
    K.Ben