Where is a good place to buy a optispark. I was looking at MSD, and pretty expensive, is it worth it??

 

i am using a msd and have had no problems, some of the guys have. gm performance is the best to use but isnt cheap. used to be less than the msd. cf sponsor chandlermotorsports seem to make a good one that has a warrenty. 170 or so bucks.
http://chandlermotorsports.com/11040...optispark.html