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
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.
splitfire plugs will run too hot and can damage your injectors... how do I know this? Well, from burning the injectors on my '95 Cutlass Supreme when I owned it.
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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