ignition coil

my friend gave me what he calls"a performance ignition coil" looks just like my mazdas, but idk if i can put just any coil on my truck, i dont wanna ruin anything.


it has the following numbers/words on it

"USE ONLY WITH EXTERNAL RESISTOR" <--which idk what that means

12V

C-500

^on the side of it (please note its a cylinder i cant say sides lol jk)

and on the bottom

BJC


and it sounds like theres a liquid inside.

can you post a pic of it?

please post a pic...