Maserati Quattroporte 5th Gen M139 (2004-2012)

M139 platform — completely new design by Pininfarina, with classic Italian proportions, long hood, short rear deck, long wheelbase. Built at Maserati's historic Modena facility (2004-2009) then transferred to the new Grugliasco plant (Turin) from 2009 onwards. Ferrari-built dry-sump 4.2L F136Y V8 (400 hp / 339 lb-ft) on Quattroporte / Quattroporte Executive GT — same engine architecture as the Ferrari F430. 4.7L F136Y V8 (425 hp / 361 lb-ft) on Quattroporte S (2008+) and Quattroporte Sport GT S (440 hp variant 2009-2012). Initial transmission: ZF 6HP 6-speed automatic mounted at the rear (transaxle layout for 50:50 weight distribution) — sometimes called Duoselect or ZF Sportshift on early cars. RWD only. Standard equipment: full Italian leather, Bose audio, 14-way power front seats, electrochromic mirrors. Optional: Bowers & Wilkins audio, ventilated rear seats, premium leathers (Pelle Frau, Poltrona Frau). 2008 mid-cycle facelift introduced the Quattroporte S V8 (4.7L 425 hp), revised front fascia. 2009 'Sport GT S' added 20-inch wheels, sport-tuned suspension, sport exhaust. Final special editions in 2011-2012. Total M139 production: approximately 25,000 cars across 8 years. Now firmly cult collector — particularly the Sport GT S and the early 4.2L Cambiocorsa cars are sought after.