SKU: 64581389142

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

Sale price$303.75 Regular price$337.50
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Ships within 48 hours · Estimated delivery Jul 28 - Aug 2

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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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Morgan S
Houston, US
★★★★★ 5
Seem to run slightly larger
Size: 3T-4T, Unit Count: 112
These are cute and my son loves the Buzz picture on them. I buy multiple different pull ups, and these have been great however I do think they run slightly larger. The quality is great, we haven’t had any leaks, and my son loves to wear them. He can easily pull them up and down himself.
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Reviewed in the United States on September 17, 2024
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T
Lake Worth, US
★★★★★ 4
Soft and comfortable for sensitive skinned toddlers
Size: 2T-3T, Unit Count: 76
I’ve been using the Pull-Ups Boys' Skin Essentials Potty Training Pants for a few months now, and overall, they’ve been a great help during potty training. One of the best features is the velcro sides, which make on-the-go changes a breeze—especially when I need to leave my toddler’s shoes and pants on. It’s incredibly convenient and saves time. The training pants are also very soft and comfortable, which is important for a toddler with sensitive skin. However, I did have to size up as my toddler quickly grew out of them. (wears a size 2t but he fits the 4t pullups better) While these Pull-Ups have worked well for daytime use, I have experienced some issues with overnight leaking. This can be a bit of a hassle, so I’m still experimenting with different strategies to manage that. Overall, though, they’re a solid choice for potty training and are very comfortable for my toddler. Highly recommend for daytime use, though you might want to consider something else for overnight protection.
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Reviewed in the United States on December 26, 2024
B
Verified Purchase
Brice
Whiting, US
★★★★★ 5
Soft, Gentle, and Perfect for Sensitive Skin
Size: 2T-3T, Unit Count: 76
We use Pull-Ups Skin Essentials as “sleeping underwear” for nap time and bedtime with my mostly potty-trained son. He has eczema and is very sensitive to many diaper brands, but these have been amazing! They’re super soft, fit comfortably, and sit well on his skin without causing any rashes or breakouts. They also absorb well — we haven’t had any issues with leaks. A fantastic option for little ones with sensitive skin!
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Reviewed in the United States on June 19, 2025
M
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monique
Houston, US
★★★★★ 5
No leaks or blowouts! Great for sensitive skin
Size: 3T-4T, Unit Count: 112
We swapped my son who has sensitive skin to these and its been about 3 weeks with zero issue. No leakage(I put them through heavy testing) and no blowouts so far!
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Reviewed in the United States on February 15, 2026
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Iryna
Los Angeles, US
★★★★★ 5
Excellent quality and adequate price
Size: Size 4, Unit Count: 120, Size: Size 4, Unit Count: 120
Got it — I’ll write you a strong, natural, insight-rich review I’ve been using these diapers consistently since my daughterwas born, and after several reorders, I feel confident sharing a detailed review for parents who are trying to decide. First, what really stands out is how lightweight yet absorbent they are. They don’t feel bulky when my baby is wearing them, which makes a noticeable difference in comfort—especially during longer stretches like naps or overnight use. Despite being light, the absorbency is reliable and holds up well throughout the day. One feature I truly appreciate is the quality of the inner filling. Unlike some other brands I’ve tried, the padding here does not become lumpy or uneven, even after extended wear. It stays evenly distributed, which not only improves comfort but also helps prevent leaks. Comfort overall is excellent. The material feels soft against the skin, and I haven’t noticed any irritation or redness. Another big plus for me is that these diapers are completely free of any strong odors or artificial scents. Some brands have a noticeable smell right out of the package, which I personally don’t like—but these are refreshingly neutral. Fit-wise, they stay in place well and don’t sag easily, even when full. That adds peace of mind, especially when we’re out or during overnight use. I’ve reordered these multiple times now, which says a lot. They’ve been consistently reliable, comfortable, and well-made. Based on my experience, I would definitely recommend them to other parents looking for a dependable everyday diaper. Overall, a solid choice that balances comfort, quality, and performance.
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Reviewed in the United States on March 20, 2026

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