Jeep Ignition Parts and Accessories by Davis Unified Ignitions

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
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.
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
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.
For CJ5, CJ7, CJ8 Scrambler |
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| 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 |
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| 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
The Firepower Ignition Kit includes several Jeep accessories and parts to enhance the performance of your ride.
The Benefits From these Upgrades:
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The Kit Includes:
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| 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
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.
| 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
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
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.
| 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
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 |








DUI-40620




