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I have heard stories from car owner saying that after they change their single "leg" plug to double or triple "leg", their cars start to behave strange and always vibrate during slow. Is this true? Have anyone out there tried changing their honda plugs? Hows the effect?

 
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i put my third leg in place of one of the sparkplugs and got a bad burn, ill never do that again.

 
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You mean its true? Changing to a three leg plug will damage the car?
You mention a burn, what does it exactly mean?

 
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Smartass. Best laugh I had all day! I have Bosche +4 in mine and no problems. I will be using Denso IK20s next.

 
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Denso or Zaks IK20 are great I love them

 
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so how good are the densos? i'm thinking about getting some

 
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I cant say that you get HP out of them but they give you better response and they dont seem to blow out when you get up in the red. I use 93 octane in my car and when I am around 6K they seem like the spark is not strong enough anymore and now its all different. plus the engine seems to accelerate smoother than before

 
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I also use Bosche +4, the first set I used I cranked one down too far an fizzzuked the plug, after installing new ones the car runs smooooth.