Quote Originally Posted by s8prtotype View Post
The newer RS4 Avant and the RS5 have bigger wave rotors for the rear and all you have to do is space the caliper to fit. But you need 19's at least.
What size are the rear brake discs you're talking about, because I find these Audi RS5 2013-2014 on ebay and 330mm brake discs are smaller than the RS6 C5 ?

http://www.ebay.com/itm/Disc-Brake-R...f49315&vxp=mtr