Not sure which 2011 Mercury Grand Marquis Air Intake Systems are right for you? We have over 20796 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Don't know about mileage increase but the Merc definitely seems a little more eager to go. Smoother acceleration and it sounds great. Easy install with the exception of needing star drivers to remove air sensor. Its a new GM and a great long term investment. Duals are next." —J D from Gainesville, GA bought a K&N 69 Series Typhoon Intake Systems for a 2011 Mercury Grand Marquis.