Here are the engine options for the 2009 Maserati Quattroporte:
* 4.2L V8: This engine had two different outputs. The standard version had 400 hp and 384 lb-ft of torque. The Sport GT version had 430 hp and 406 lb-ft of torque.
* 4.7L V8: This engine was found in the Quattroporte S and produced 430 hp and 406 lb-ft of torque.
Let me know which engine you're interested in and I'll be happy to tell you the torque!