Continue Shopping.
View cart with tax and discounts.

Jet Performance Chips

1987-1995 Wrangler YJ


A "Stage 1" performance chip is ideal for the person looking for a little extra horsepower, without a lot of modification. This stage allows our customers, with stock or barely-modified vehicles, to use a performance module with less expensive, lower octane fuels (87 octane). With Stage 1, the programming is set to burn fuel at peak efficiency resulting in not only optimal performance, but gas savings as well.

A "Stage 2" Performance Module features the most extensive programming to enhance horsepower to it's greatest potential and maximize torque. Fuel (Requires 91 Octane) and timing curves are modified extensively for peak performance and drivability. This stage also requires the use of a 180 degree thermostat and free flow exhaust. An Aftermarket Air Intake System is highly recommended for a Stage 2 Performance Module.

Jet Performance Chip
Years Engine/Transmission Stage1 Stage2
1995 4.0L Automatic Price:$239.99
99511
Price:$259.99
99511S
1995 4.0L Manual Price:$239.99
99512
Price:$259.99
99512S
1994 4.0L Automatic Price:$239.99
99411
Price:$259.99
99411S
1994 4.0L Manual Price:$239.99
99412
Price:$259.99
99412S
1993 4.0L Automatic Price:$239.99
99311
Price:$259.99
99311S
1993 4.0L Manual Price:$239.99
99312
Price:$272.99
99312S
1992 4.0L Automatic Price:$239.99
99212
Price:$259.99
99212S
1992 4.0L Manual Price:$239.99
99211
Price:$259.99
99211S
1991 4.0L Automatic Price:$239.99
99112
Price:$259.99
99112S
1991 4.0L Manual Price:$239.99
99111
Price:$259.99
99111S