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This is one of those open ended questions, your going to get a million answers. So I'll tell you what i've been told from a tech at Jocobs Electronics. The +4 plugs are useless, champion plugs are the worst on the market and autolite plugs are the best on the market.

My advice, use the plugs that your dad used in his cars ;)
 

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Hey MxPx, where did you get that 'trep picture(in sig)? Because I was looking at it closely and think that you have used my picture from my sig.
 

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Champion plugs are the worst?

See we have conflicting reports again... I have heard that Champion are one of the best if you are looking to upgrade your OEM plugs.

Autolite plugs are best in racing and high peformance applications only. There isn't a noticable difference in the two plugs in our cars (3.5L) or at least there wasn't in my car.
 

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I got the platnum +4's and don't really notice any difference. :|
probably go back to some straight platnum plugs to be on the safe side.
 

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my platinum +4's work great. I noticed an difference right away. Course, I needed new plugs.
 

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I have only used Bosch Platnum over the last 10 yrs and never had a problem. I have had two friends that used splitfire and had nothing but problems.....probably can't go wrong buying OEM plugs from D-C either, JMHO
 
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