The factory stamped steel tunnel brace leaves little to be desired. We've redesigned ours to sit slightly lower in the tunnel to allow for larger exhaust tubing. As an added benefit, the CNC-bent laser-cut brace adds additional structural rigidity to the chassis! Fits Audi A6 12-18, A6 Quattro 12-18, A7 Quattro 12-18, RS7 14-18, S6 13-18, S7 13-18