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coolhandcountry · 05.24.2006, 07:54 AM

I think they are the different heat ranges on the plugs. That was the way hpi was. I can't recall which was which. I think the higher number was a colder plug.

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coolhandcountry RC-Monster Mod Offline Posts: 6,741 Join Date: Jul 2005 Location: VA in the US	05.24.2006, 07:54 AM I think they are the different heat ranges on the plugs. That was the way hpi was. I can't recall which was which. I think the higher number was a colder plug. Peace! Country Help support the Rc-Monster Buy here