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I have used them in the past as i had a slight judder and it was suggested i should try a colder plug such as IK22s and car was beautiful - since than i put new ones and car wasnt great so went back to standard and all is fine.....................

doesnt really help sorry
 

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Heard good things about them...put off when Danny_Lad with his Seat Ibiza found what is now a common problem with them....one of the tips snapped off and ended up mashing his supertech valves in his engine. Seems its happened a few times to people!
 

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Not from google, just heard people talking about the cheaper Denso plugs having a similar problem. Likeihood is Danny's car ran too hot and killed the plug.

I really need to change my plugs though, might be playing a part of my terrible mpg lol
 
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