msd distributor difference?

[73chargercali]

hi everyone,
i was looking at msd's distributors in summit's catalog and found MSD-8546 pro-billet for $295 and MSD-8387 for $394, yet the description makes the cheaper one sound better and doesn't seem like theres a difference between the two. can anyone explain which one is better? i plan on running the 6al box i already own.

thanks

[73chargercali]

never mind the $295 one suits my needs, i think.