Create a high-resolution concept rendering of a custom BMW 420d F36 Gran Coupe M Sport reimagined in a futuristic, Motomuzi-inspired design language. Extend the front end to feature an extra long, classic-inspired bonnet that visually balances with a low-slung fastback roofline. The roof must flow uninterrupted from windscreen to rear bumper in a single arc lip, spoiler, or visual break. Sculpt the body with ultra-clean surfacing, flush glass, minimal panel gaps, and integrated lighting. Use oversized 22-inch alloy wheels, wide-body fenders, M Sport front bumper and side skirts, all fused into a seamless silhouette. Finish in metallic grey with dark glass and subtle black accents. Prioritize a dramatic grand tourer stance with a front-engine, rear-weighted proportion. The result should be concept-grade, production-realistic, and visually striking from all angles. rofile 68g113r