When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The MSD 5 is a lower output type box for daily driver use with no increase in fuel load, I.E. Cams, manifolds, carbs, etc.
The MSD 6 is designed for as said above, an increase in fuel load, and or compression with a greater power output to overcome larger static loads. Keep in mind you'll need a good coil to make it all come together. In switching to a Capacitive Discharge (CD) ignition, the coil will get a full saturation (unlike conventional ignition) and will overheat more rapidly. Spare no money on the coil or it'll leave you stuck one day.
Hope that helps.
Chris
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.