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I'm running BERU plugs from Germany. Here in Australia they made a gain of 7hp on a stock wrx. I'm happy with the way the nx is running and the fact that they dont need to be changed for another 50,000km.
 

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2,170 Posts
I dynoed new Bosch +4 plugs, and found they made 4 hp less at the wheels as compared to old, dirty NGK stock plats on a lightly modded 1995 200sx SE-R.

YMMV, but that was enough to convince me to continue to use stock plugs instead.

I think of them as "Bosch minus 4 plugs" now
 

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_______
Joined
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2,170 Posts
I dynoed new Bosch +4 plugs, and found they made 4 hp less at the wheels as compared to old, dirty NGK stock plats on a lightly modded 1995 200sx SE-R.

YMMV, but that was enough to convince me to continue to use stock plugs instead.

I think of them as "Bosch minus 4 plugs" now
 
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