Miata Mailing List: July 1994, Message #103
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   From: Herb Samuels 
Subject: Re: Splitfire Plugs and Wires
   Date: Wed, 6 Jul 1994 13:12:29 -0400

I think that the Splitfire Plugs and wires are highly overrated and
probably do nothing for a performance improvement.  I have compared   
both Splitfire plugs and NGK plugs in my Miata and found no
improvement in performance with the Splitfires although they are about
3-times more expensive.  You can get a refund from Splitfire within 30
days if you don't like them so it wouldn't hurt to try them to satisfy
your curiosity.  One important point.  The sealing washer on the
Splitfire plugs is not fixed to the plug so when you remove the plug
there is a 50:50 change that the washer will remain in the recessed
area of the engine.  Its a pain to remove.  If you don't realize that
the washer is left behind and you reinstall another plug it may not
seal correctly so be careful.  This is a knowm problem with the design
of Splitfire plugs.  Also, the  top of the Splitfire plug is somewhat
larger than the NGK plugs so the wire connecter is difficult to get
off the Splitfires.  Be very careful how you remove the cable or you
may break the wire.

Herb Samuels