Not sure which 2003 Jeep Grand Cherokee In-Line Modules are right for you? We have over 945 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:
"The Jet module worked exactly as promised. Mid-range power from 0 - 60 is awesome. I've actually noticed (after I eased up abit on racing) that my gas mileage has increased about 1-1/2 mpg! Pretty good for a clunky Jeep." —Bradley D T from Milwaukee, WI bought a Jet Performance Module for a 2003 Jeep Grand Cherokee.
"Amazed at the instant horsepower gain. Gas milage is better. I will order one for my wife's mustang." —Dennis S from , bought a Jet Performance Module for a 2003 Jeep Grand Cherokee.