Mini-Z RWD Porsche 911 GTR RS GT MR-04 Readyset, SilbermetallicKYO32358S Mini Z RWD Porsche 911 GTR RS GT MR 04 Readyset, Silbermetallic The MINI Z RWD MR 04 series replaces the MINI Z RWD MR 03 series. The MR 04 version RWD chassis is equipped with a revamped steering system that features optimized geometry and tighter clearance between moving parts. Also, the lower CG enabled by the lowest possible battery mount position ensures faster cornering speed and less chance of flip over. The RX unit is equipped with