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MSD Ignition Digital 6-Plus Ignition Control Box


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Digital 6-Plus Ignition Control Box
Digital 6-Plus Ignition Control
  • Per Spark Energy: 135 mJ
  • Built-in 2 Step Rev Limiter
    (One Stage of Retard and Start Retard)
  • CARB E.O Number D-722-2
  • Red
  • Free Shipping - Estimated to ship direct from manufacturer on 09/26/23 , pending manufacturer availability. Learn More

    Thank you! We will notify you when this product becomes available.


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    6520 is rated 4.8 out of 5 by 9.
    Rated 5 out of 5 by from MSD Digital 6-Plus owner review A great ignition with all the features... Performance: I use this ignition on my V-8 powered 1985 5 ton work truck. It made a notable improvement in starting and power. Even more impressive, I can now pulls hills without downshifting that required dropping a gear before. The power difference is not real noticeable but smoother and quantifiably better, and it never misfires as it would occasionally do before. I had written a LOT of feature details which this review submittal program rejected as profanity. Web host person - fix this! For a street or strip car, I think this is a FANTASTIC ignition. I have used seven different ignition boxes in various vehicles over the past 20 years, and this one has the most features of any I have used. With proven reliability, and this many features, what's not to love. For a daily driver or strip use, this is an awesome ignition.
    Date published: 2021-04-11
    Rated 5 out of 5 by from Upgraded CD box Was still using an analog 6A from 1988! Decided it was time to try a Digital 6 with the built in features. Nice box. Added NX system and will use the nitrous function when it's activated.
    Date published: 2020-12-23
    Rated 5 out of 5 by from MSD does it all ! I was looking to handle multiple function upgrades to my ride. Two key areas were providing a rev limiter for my front brake line lock and a way to adjust timing when using a nitrous system . The MSD 6 Plus does it all without adding other system controls. This saved dollars and space. Installation was very strait forward and the additional controled functions now operate flawlessly. Looking forward to fine tuning come spring.
    Date published: 2019-01-22
    Rated 4 out of 5 by from Excellent feature for Nitrous system Haven't installed it yet recommend by friend for my engine build running single stage nitrous system.
    Date published: 2016-01-11
    Rated 4 out of 5 by from Nice features and easy install Installed a few weeks, nice features and quick and easy install only reason for 4star is that I wish I'd went ahead and bought the programable 6 since the prices are so close.
    Date published: 2015-12-09
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    Will this replace factory ecu if installing a laptop motor in a pre-70 nova

    Asked by: Recon1984
    MSD 121-6520 no this is only an ignition system it does not control fueling
    Answered by: langus
    Date published: 2022-10-04

    can i use a 8251 coil

    Asked by: bobbyjob69
    The 8251 coil is not compatible with this box.
    Answered by: Jon Jegs Tech
    Date published: 2023-06-21
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