what exhaust should i put onmy grand marquis

Keep it stock. Grand Marquise is a granny car.

If you have to put something on there, go with flowmaster or magnaflow. But just a word of advice, its not going to look right seeing a granny car with a loud exhaust.

what year is it the newer ones already have stainless pipes and mufflers on them should last longer than most u can go to a catback system in stainless if you want something different do u have single or dual exhaust?AND that depends on what model u have from them.u havent given enough info to be answered correctly good luck