Quick acceleration off the line, faster 0-60 times and more towing power is yours with the Jet Performance Module. This performance module installs easy, is 50-state street legal, and works for both stock and modified powerplants. Plus, Jet backs this module with a 1-year warranty.
Crush the dyno and dominate the streets with the Unichip Performance Chip. This Unichip in-line module piggybacks your vehicle's ECU to unleash hordes of hidden power and torque. Tuned for stock and modified vehicles. 1-year warranty.
Take your performance to mach-1 with the Jet V-Force Plus Power Control Module. This in-line module improves performance and acceleration—taking your ride to the next level. Plus, 14 screen views let you keep tabs on what’s happening under the hood. 1-year warranty,
Not sure which 1999 Jeep Wrangler 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:
"This Is My First Purchase Of Any Jet Merchandise. Easy Install....Well.....Except Changing Out The Stock Thermostat To A 180 Degree One, Which Is Required For The Stage II Module On The 4.0 Straight 6 Engine. That Seemed To Become A Major Ordeal For Some Reason. We Will Call That "SGS" ("S"tupid "G"uy "S"yndrome). All That Aside, Everything Went Fine. I Started The Vehicle Up After Install And After Warming Up For A Few Minutes, Immediately, I Noticed A Definite Smoother Idle. I Also Noticed A Definite Cooler Operating Temp On The Dash Gauge. After Driving Fairly Conservative For About 8-10 Miles, I Did Some Harder Accelerating From Stops And On Entrance Ramps To The Interstate. They Was A Definite Improvement In Acceleration Thru The Whole Powerband And The Throttle Seems Much Snappier. Now, Don't Read Into This Too Much. This Is Not A Mind Boggling Change In Performance, But It Is Noticeable. I Have The Banks Power Torque Tubes And Monster Exhaust And That Install Improved Performance. I Installed The Banks Power Ram Air System And That Improved Performance A Little. I Installed An Aftermarket Throttlebody Vortex Spacer And That Was The Least Noticeable In Performance. I May Try The Jet Throttlebody Spacer To See If That Is Better. Soooo...........What I Am Saying Is Every Little Enhancement Helped The Performance. It's Too Early To Tell About Gas Mileage. I Recommend These Type Of "Bolt On" Upgrades Over Tearing An Engine Apart, Changing Heads, Pistons, Cams.......Etc. I Purchased This Jeep New 10 Years Ago And Kinda Babied It Over That Time. I Also Installed New Fender Flares And Body Armor Just As A 10 Year Birthday Gift To The Jeep As With All The Above Installed Items." —Ken S from Verona, KY bought a Jet Performance Module for a 1999 Jeep Wrangler, 4.0L 6-cyl..