Jeep Ignition Parts and Accessories by Davis Unified Ignitions

Jeep Ignition Performance and Racing parts

Performance Distributors now offers the D.U.I. (Davis Unified Ignition) for AMC engines. The AMC D.U.I. is a one-piece ignition system with the coil in the distributor cap and the module inside the distributor. The D.U.I. Coil produces 50,000 volts and allows spark plug gaps to be opened up to .050" - .055". The Performance Distributors Dyna-Module has more electronic dwell time in it to give the coil more saturation time and produce a hotter spark. The D.U.I. distributor eliminates the ballast resistor that is used on the stock AMC ignition system. This will allow full alternator voltage through the ignition system and will provide a stronger spark and more power.

The AMC D.U.I. is a real work of craftsmanship and although it is uniquely designed, replacement parts are easy to find. High Energy Ignition (H.E.I.) replacement parts will fit right on the D.U.I. These parts can be found at any local auto parts store.

Davis Unified Ignition recommends the use of Autolite Platinum Spark Plugs found below.


DUI Performance Distributors

Jeep Distributor by DUI

Each D.U.I. Distributor is tuned on a distributor machine based on the specs of the engine. A super smooth advance curve will eliminate engine damaging detonation and give instant throttle response. The unit is polished and lubed as it is assembled making it a true blueprinted distributor.

Autolite Platinum Spark Plugs

For CJ5, CJ7, CJ8 Scrambler, Cherokee and Wrangler YJ (Carbureted)

Description Engine Application Part Number Price Buy Now
DUI Performance Distributor AMC Inline 6 Cylinder, 232-258 CID DUI-40620 $299.99
DUI Performance Distributor AMC 2.5L 4 Cylinder, Non-Computer DUI-40420 $379.99
DUI Performance Distributor Tornado Jeep 6 Cylinder, 230cCID DUI-40920 $549.99
DUI Performance Distributor AMC V8 Engines (290,304,343,360,390 & 401 CID) DUI-40820 $299.99
DUI Distributors - Racing Version AMC V8 Engines (290,304,343,360,390 & 401 CID)
Vacuum Advance
DUI-408211 $439.99
DUI Distributors - Racing Version AMC V8 Engines (290,304,343,360,390 & 401 CID)
Mechanical Ad
DUI-408212 $439.99


Live Wires

Jeep Distributor by DUI

Performance Distributors LiveWiresŪ come with a space age, heat resistant sleeving that provides superior protection to the plug wires from the extreme underhood temperatures generated by the exhaust. The sleeving is a non-flammable heat treated glass braid, much like the type used on todays ovens. The unique sleeving on the LiveWires provides heat protection up to +1400° F and offers excellent resistance to moisture and chemicals.

LiveWires are custom fit, so no assembly is required. Each wire is numbered on both ends for the correct cylinder making installation, removal and re-installation quick and easy. No cutting, splicing or crimping is required like other aftermarket wire sets. Some applications are available for both over the valve covers and under the headers.

Autolite Platinum Spark Plugs


For CJ5, CJ7, CJ8 Scrambler
Cherokee and Wrangler YJ
(Carbureted)

Black Jeep Live Wires DUI Performance Jeep Red Live Wires by DUI Performance Blue DUI Performance Live Wires for Jeep DUI Performance Jeep Yellow Live Wires Purple Performance Live Wires by DUI for Jeep
Engine Application Price Black Red Blue Yellow Purple
AMC And Tornado Inline
6 Cylinder Jeep Engines
$89.99

DUI-C9077BK

DUI-C9077R

DUI-C9077BU

DUI-C9077Y

DUI-C9077P

AMC V8 Engines
(290, 304, 343, 360, 390 & 401 CID)
$105.99

DUI-C9076BK

DUI-C9076R

DUI-C9076BU

DUI-C9076Y

DUI-C9076P



For Wrangler, Cherokee and Grand Cherokee
(Fuel Injected)

Black Jeep Live Wires DUI Performance Jeep Red Live Wires by DUI Performance Blue DUI Performance Live Wires for Jeep DUI Performance Jeep Yellow Live Wires Purple Performance Live Wires by DUI for Jeep
Engine Application Price Black Red Blue Yellow Purple
1991-1999 4.0L
(Inline 6-Cylinder) Engines
$92.99

DUI-C9087BK

DUI-C9087R

DUI-C9087BU

DUI-C9087Y

DUI-C9087P

1991-1999 2.5L
(4-Cylinder) Engines
$79.99

DUI-C9098BK

DUI-C9098R

DUI-C9098BU

DUI-C9098Y

DUI-C9098P

1993-1998 5.2L
(V8) Engines
$99.99

DUI-C90875.2BK

DUI-C90875.2R

DUI-C90875.2BU

DUI-C90875.2Y

DUI-C90875.2P

2002-2006 2.4L
(4-Cylinder) Engines
$85.99

DUI-C9083BK

DUI-C9083R

DUI-C9083BU

DUI-C9083Y

DUI-C9083P



Firepower Ignition Kits

DUI Firepower Ignition Kit

The Firepower Ignition Kit includes several Jeep accessories and parts to enhance the performance of your ride.

The Benefits From these Upgrades:
  • Greater Throttle Response Time
  • Better Fuel Economy
  • Wider Spark Plug Gaps
  • Quicker Starting / Smoother Idle
  • More Horsepwer and Torque
  The Kit Includes:
  • Screamin' Demon Coil
  • LiveWires (Red)
  • Cap and Rotar (Black)
Autolite Platinum Spark Plugs
Description Years Engine Application Part Number Price Buy Now
Firepower Ignition Kit 1991-1999 4.0L, 242 Cid, Inline 6-Cylinder Engines DUI-4.0KIT $189.99
Firepower Ignition Kit 1991-1999 2.5L 4-Cylinder Engines DUI-2.5KIT $199.99
Firepower Ignition Kit 1993-1998 5.2L V8 Engines DUI-5.2KIT $195.99
Firepower Ignition Kit 2002-2006 2.4L 4-Cylinder Engines DUI-2.4KIT $159.99


Screamin' Demon Coils

DUI Screamin Demon Coils

The Screamin' Demon Coils are designed to produce an exceptional spark throughout the entire RPM range with virtually no drop in power. Stock coils are notorious for falling off as RPM goes up. Our Screamin' Demon Coil has been dyno tested providing 3 more horsepower at 5000 rpm over stock coils. The Screamin' Demon has a brass terminal for which your coil wire attaches to. The brass terminal is more conductive than the stock aluminum terminal and will resist corrosion longer. Spark Plug gaps can be widened to .065" due to the energy of this coil. The wider spark plug gap will allow more spark energy into the combustion chambers providing more power and improved mileage. The Screamin' Demon is too "hot" for stock plug wires. 8 mm spiral core wires are highly recommended. The Screamin' Demon is an externally mounted coil.

*NOTE: 1991-1992 and 1998-1999 Jeeps require the Wiring Harness Adapter (which can be found here on this page) for our Screamin' Demon Coil to work with the factory plug in harness.

Autolite Platinum Spark Plugs

Description Years Engine Application Part Number Price Buy Now
Screamin' Demon Coils 1991-1999 4.0L (6-Cyl), 2.5L (4-Cyl) And 5.2L (V8) DUI-31728 $65.99
Screamin' Demon Coils 2002-2006 2.4L (4-Cylinder) Engines DUI-31732 $75.99


Coil Wiring Harness Adapter

Jeep DUI Performance Coil Wiring Harness Adapter

1991-1992 and 1998-1999 Jeeps require the Wiring Harness Adapter for our Screamin' Demon Coil to work with the factory plug in harness. This adapter harness is easy to install with no cutting or splicing to the factory wiring harness. Please note that this part is sold separately and is not included with the ignition kits.

Description Years Comments Part Number Price Buy Now
Coil Wiring Harness Adaptor 1991-1992 Jeeps Require a Wiring Harness Adapter DUI-031105 $22.99
Coil Wiring Harness Adaptor 1998-1999 Jeeps Require a Wiring Harness Adapter DUI-31728AH $32.99


Cap and Rotor

Cap and Rotar DUI Performance

The Jeep Cap and Rotor kit features brass terminals which are more conductive and resist corrosion longer than caps with aluminum terminals. This cap and rotor kit has excellent dielectric strength and resists carbon tracking.

Autolite Platinum Spark Plugs

Description Years Engine Application Part Number Price Buy Now
Performance Cap And Rotor Kit 1991-1999 4.0L (Inline 6-Cylinder) Engines DUI-35100 $25.99
Performance Cap And Rotor Kit 1991-1998 5.2L (V8) Engines DUI-35200 $29.99
Performance Cap And Rotor Kit 1991-1999 2.5L (4-Cylinder) Engines DUI-35300 $27.99


Autolite Platinum Spark Plugs

Autolite Platinum Spark Plugs

D.U.I. recommends the use of Autolite Platinum spark plugs to be used with all their ignition systems. Choose the spark plugs for your particular Jeep application from the table below.

Description Years Engine Application Part Number Price Buy Now
Autolite Platinum Spark Plug 1972-1991 All V8 Engines AP65 $3.49
Autolite Platinum Spark Plug 1978-1990 4.2L 258CI In-Line 6 Cyilinder AP985 $3.49
Autolite Platinum Spark Plug 1983-2001 2.5L 4-Cylinder AP985 $3.49
Autolite Platinum Spark Plug 1991-2006 4.0L 242CI In-line 6-Cylinder AP985 $3.49
Autolite Single Platinum Spark Plug 2002-2006 2.4L 4-Cylinder AP5263 $3.49