opti-spark
08-29-2006, 09:42 PM
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opti-spark the MSD pro billet came with an rubber "O-RING". i accidently forgot to put it on. what is the purpose of that ring and can it affect the performance on my car??? 
08-29-2006, 09:57 PM
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I'm not sure but without it I think moister will get in alot easier and will shorten the life of your opti. That's why the Dynaspark looks like fort knox.
