Progression ignition distributor dosnt use a box.
Everything you need is built right in the distributor with the added bonus of infinite map creations that are created thru an app on your phone and sent instantly thru blue tooth to your distributor as you drive.
Also has a lock out feature so if someone try’s to steal you car they cannot start because distributor is electronically disabled until you re-enable with your phone.
Cats ass of distributors.
I replaced my MSD with Progression Distributor, couldn’t be happier!!!
https://progressionignition.com/