SKU: 64581389142

MSD Ultra 6AL Ignition Box With Rev Limiter Red # MSD6423

Sale price$303.75 Regular price$337.50
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Description

MSD Ultra 6AL Ignition Box With Rev Limiter Red # MSD6423Ignition Box, MSD Ultra 6AL, Digital CD, with Rev Limiter, Red, Each Compact design full MSD power. Bluetooth service only available within the USA and Canada. Bluetooth service not compatible for use in Australia. Ignition Box Output: Capacitive discharge Circuitry: Digital Rev Limiter: Yes Timing Retard: One stage Data Acquisition: No CD Voltage Output to Coil: 520 540 V Current Draw: 0. 8 amps per 1,000 rpm Spark Output (millijoules): 150 mJ

Ignition Box, MSD Ultra 6AL, Digital CD, with Rev Limiter, Red, Each

Compact design - full MSD power. Bluetooth service only available within the USA and Canada.

Bluetooth service not compatible for use in Australia.

Ignition Box Output:

Capacitive discharge

Circuitry:

Digital

Rev Limiter:

Yes

Timing Retard:

One-stage

Data Acquisition:

No

CD Voltage Output to Coil:

520-540 V

Current Draw:

0.8 amps per 1,000 rpm

Spark Output (millijoules):

150 mJ

Minimum Operating Voltage:

12 V

Maximum Operating Voltage:

15 V

Length (in.):

3.800 in.

Width (in.):

3.300 in.

Ignition Box Color:

Red

Coil Included:

No

Warranty:

1-year

Quantity:

Sold individually.

Notes:

Features a start retard, step retard, and 3 rev limiters.

MSD Ultra 6AL Ignition Boxes

The new Ultra 6AL Series ignition boxes deliver full MSD power in a compact, lighter package! The Ultra 6AL Series continues to use a high-speed controller that can make extremely quick compensations to the output voltage, multiple spark series, timing and rpm limits, while maintaining precise timing and accurate rev limiting. The circuits and controller of the MSD have been thoroughly filtered to create protection against Electro Magnetic Interference (EMI). Ultra 6AL Series features a capacitive discharge ignition design. (The majority of stock ignition systems are inductive ignitions, in which the coil must store and step up the voltage to maximum strength in between each firing. At higher RPM, since there's less time to charge the coil to full capacity, the voltage falls short of reaching maximum energywhich results in a loss of power or top end miss.)

MSD Ultra 6AL ignition box details:

* High conversion efficiency ensures minimal heat generation and maximum spark energy output with less current draw from the battery
* High RPM operation and maximum output using the Blaster HVC, PN 8252 or HVC II, PN 8253
* Powerful capacitive discharge of multiple sparks improves performance
* Consistently high spark energy of 135mJ to 150mJ for every firing, from idle to redline RPM
* Increase spark series duration lasts for 18 of crankshaft rotation
* Easily installs on 4, 6, 8-cylinder engines with distributors
* Operates on most 7 to 28 volt electrical systems
* Connects to points, magnetic pickups, and hall/crank input distributors
* Bluetooth connectivity to mobile app interface for settings and monitors
* MSD CAN communication for easy connectivity to MSDView using a CAN MSD Hub and Power Grid USB or CAN-USB Bridge 89982 product
* Fully protected against an open coil, shorted coil and open load
* Compact design full MSD power
* Quickens throttle response and improves starting
* Tach Output
* Launch, Burnout, and Step Retard activation inputs available. This ignition box has a built-in tri step RPM rev limit controlled by the mobile app
* Mobile app available settings: Cylinder selection, Step retard value, Launch RPM value, Burnout RPM value, Max (Race) RPM Value, Start retard value
* Programmable Step Retard: On Ramp time, Off Delay, Off Ramp Time, Engine RPM for activation
* Programmable Start Retard: 0, 10, 20 degrees
* Alerts and monitors available
* High level of security connection from phone to ignition box (encryption), including sequence in push-button implementation
* Maximum programmable retard of 30 degrees

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 64581389142

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K
Verified Purchase
Kevin Keegan
West Palm Beach, US
★★★★★ 3
Runs large
Size: 7 Big Kid, Color: White
Runs very large.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
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Verified Purchase
Lou
Massapequa, US
★★★★★ 5
a little roomy for narrow feet.
Size: 6 Big Kid, Color: Black/Black
Nice shoes. My little one has narrow feet so they are a little lose. Overall, a nice shoe.
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Reviewed in the United States on June 4, 2026
K
Verified Purchase
KNE
Los Angeles, US
★★★★★ 5
comfortable
Size: 7 Big Kid, Color: Black/Black
super comfortable!
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Reviewed in the United States on May 30, 2026
M
Verified Purchase
Mike Summers
Boise, US
★★★★★ 5
Great shoes
Size: 5 Big Kid, Color: Navy/Blue
Loved them but bought a size too small so had to buy another pair…my bad 🤦🏽‍♀️
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Reviewed in the United States on May 20, 2026
T
The Pacific Northwesterners
Natrona Heights, US
★★★★★ 4
Comfortable and Easy to Wear Daily
Size: 2 Little Kid, Color: Navy/Blue
My daughter has been wearing these navy/blue shoes since the weather has been less rainy and more sunny. They are great for outdoor play, especially on days when it's warm outside. The knit mesh upper keeps her feet from overheating, and the cushioned insole feels supportive without being stiff. At size 2, the fit is accurate and the width runs a bit roomy, which gave her some growing room without feeling loose. The slip-on design with elastic laces and pull tabs is a real plus. She can get them on and off without any help, which she loves. The shoes are light enough that she barely notices them during long active days. My one small complaint is that the sole feels more like firm foam than rubber, so they can be a little slippery on smooth indoor floors. For the price, these deliver solid everyday value. They look good, hold up well to regular use, and my daughter reaches for them first most mornings. Pros: - Breathable mesh keeps feet cool - Easy slip-on design with elastic laces and pull tabs - Lightweight and comfortable for all-day wear - Accurate sizing with a roomy width - Durable for the price Cons: - Sole can be slippery on hard smooth surfaces - Limited outsole grip compared to rubber-soled shoes
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026

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