1998 Jeep Wrangler 4.0L

  • The DiY Unichip kit that comes pre-mapped to optimize our bolt-ons accessories
  • Easy to follow hardwire instructions
  • Custom Tunable with Unichip Tuning Software
  • Adds 20 + hp and 25 + lb-ft of torque
-- Not CARB certified --
These parts are not legal for sale or use in California.


SKU: 2720061 3x3a MY98 Categories: ,
  • All Wrangler 4.0 L Jeeps supported from ’00, ’01, ’01, ’02, ’03, and ’04, ’05, and ’06
  • Maps available for Magnum Powers with 42 lbs Injector
  • All hardware included
  • All kits come preprogrammed with 2 maps
  • User programmable with 5 maps, requires USB to Unichip download cable ($45)
  • FREE access to Unichip Map Database
  • FREE access to Unichip Programmer Software
  • Custom Tunable
  • The Unichip is transferable to your next vehicle.
  • Engine: 4.0 liter
  • ECU Connector ( 3x3a)


Weight 4.5 lbs
Dimensions 15 × 10 × 2 in
Vehicle Modifications

Stock, AEM CAI, TB, AEM CAI, Cat/B, TB, AEM CAI, All Headers, Cat/B, TB, AirRaid CAI, TB, AirRaid CAI, All Cat/B, TB, AirRaid CAI, All Headers, All Cat/B, TB, All Cat/B, All Drop In Filters, K&N FIPK, TB, K&N FIPK, All Cat/B, TB, K&N FIPK, All Headers, All Cat/B, TB, MOPAR CAI, TB, MOPAR CAI, All Cat/B. TB, MOPAR CAI, All Headers, All Cat/B, TB


  • Add’s up to 16hp & 17ft-lb .
  • Easily plugs into the stock ECU & ECU harness in minutes , no programming necessary .
  • Realizes the full potential of Aftermarket add-on’s like Cold-Air-Intakes & exhaust systems , as each kit comes pre-mapped for the exact set-up of each car or truck.
  • No end-user tuning necessary , just plug the kit into the car & you’re ready to go.
  • Easily upgradeable for future add-on’s.
  • Each kit comes with two maps : a low octane performance map & a high octane performance map, switchable from within the vehicle.
  • Fully tuneable by a Unichip Custom Tuner for customized add-on’s . This basically means that the Engine Management System in your ride is now as tuner friendly as the most advanced Standalone systems in the world , without sacrificing any of the factory features. This feature is unmatched by any reflash-tuning or other similar product.
  • Plug ‘n Play harnesses are fully Flux capable – purchase Flux when you purchase the Plug ‘n Play kit or upgrade later – Flux simply plugs into the Unichip Plug ‘n Play harness.
  • Plug ‘n Play kits are removed from the vehicle in minutes , returning the vehicle to stock tuning , without leaving a footprint of ever having been modified (a feature which reflash-tuning cannot match).

Dyno Sheets

Dyno Results 1996-2004 models

Click on the dyno sheet for larger view or to print.

Tundra 5.7 liter Dyno Sheet 2009


Installation Instructions for Jeep



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Jeep Wrangler 1998
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