The Ultra 6AL expands on the 6-series lineup with three rev limiters — Launch, Burnout, and Step Retard activation — wirelessly controlled from a smartphone via the "MSD Ultra 6AL" app. A programmable step retard of up to 30 degrees is available for On Ramp Time, Off Delay, Off Ramp Time, and Engine RPM activation, with an encrypted phone-to-box connection for security. It delivers full MSD power in a compact, lighter, feature-dense package.
Specifications:
- Voltage Required: 12-15V (7V start)
- Maximum RPM: 15,000
- Spark Energy: 135-150mJ per spark
- Secondary Voltage: 45,000V
- Primary Voltage: 520-540V
- Current Draw: 0.8 amp per 1,000 RPM
- Weight/Size: 3.3" x 3.8", 344 grams
- Color: Red
- Warranty: Manufacturer's Limited 1-Year Warranty
- Part Number: 6423
Connects to points, magnetic pickups, and Hall/Crank input distributors on 4, 6, or 8-cylinder engines; programs via the MSD Ultra 6AL app or MSDView software over USB.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
Is the MSD 6423 Ultra 6AL legal for street use?
No. It's legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street.
How is the Ultra 6AL programmed?
Wirelessly from a smartphone via the "MSD Ultra 6AL" app, or through MSDView software via the integrated USB port.
What rev limiters does it include?
Three: Launch, Burnout, and Step Retard activation.
What engines is it compatible with?
4, 6, or 8-cylinder engines with points, magnetic pickup, or Hall/Crank input distributors.
