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That was probably the problem! Blue!!! If the tester was a bit unsure he may not have known what to fail it on, blue is a fail! So if you have two white, your onto a winner!
Eagle F1's? have had loads of cars in with them, they drone like hell in my opinion! Andy's exclusive has 2 on the rear, and the whine like a b**ch!! Start there matey! bet the edges are wearing a bit!
Do they sir?? learn something new every day!! Never really queried it, when i order them non gen they always send the NGK's and never mention anything else!, what they like on price? I stand corrected!!
You will see what i mean mate if you take it off, the flange welded to the centre piece has been done by a drunk irishman with a white stick!! I think it needs taking off, and re-welding!