as far as for the for what i bought,it is msd 5300,which is the msd 5200 5 series high perf inductive.it was called the 5300 cause it was made for chryslers only with the plug.he had it listed as a 6a,he was wrong.i emailed the guy who bought the 6al,and offered him more than double what he paid,i want have and test both systems....now if we can find out they made a 7al with direct plug in that wood be cool,who has the mopar performance catalog from the early to mid 90's ..... .