Coil packs are cheaper, better made IMO, I already had this swap but I'm going ahead and getting the Stage 2 coil setup, If you never heard of that> it's pretty much 3 coil instead of 1. So when you have a bad coil you only need to change one out instead of whole unit.
Casper's has the harness to do the swap but there should be a sticky on how to wire it up to work on this site.
