the Zetec never had a distributor... did it? those started to get phased out when OBD2 started. I know my 01 came with a coil pack stock...
As far a coil packs go they can allow for a "cleaner" spark so it will idle smoother in some cases. but you don't get a performance improvement when going with a different coil pack. Stock vs scream'n demon vs MSD are all the same until you start getting into the high boost applications. i think its safe to say the JRSC even with the boost kit is a boost application but is not a "high" boost.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)