i have an 87 rx7 gxl. with msd digital six plus. i want aftermarket coil or coils. i want a 2 tower aftermarket. msd does have one, but for gm. it looks like it would work on my car but i dont want to get it unless i am for sure it works.

what i want to know is how my leading and trailing coils work. how strong in volts. or where i can find out about this stuff.