Not sure which 1998 Jeep Grand Cherokee In-Line Modules are right for you? We have over 1502 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:
"Not sure about the gas mileage inprovement, but can tell the increase in horsepower." —Christopher H from Berkeley Springs, WV bought a Jet Performance Module for a 1998 Jeep Grand Cherokee, 5.9L V8.