The 2001 BMW M3 GTR (E46) is a legendary, ultra-rare homologation special, featuring a 4.0-liter naturally aspirated V8 (\(P60B40\)) engine producing around 350-380 hp in street-legal "Strassenversion" form and over 450 hp in racing trim. Built to dominate the American Le Mans Series (ALMS), only about 10 road-going versions were made, characterized by a massive rear wing, carbon fiber roof, and a high-pitched, raw exhaust note.