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9,686 Posts
The only way spark plugs would 'gain' you any HP is of your current plugs are fouled/old etc..
 

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14.1 @ 100mph N/A
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5,409 Posts
...or if you "tune" your spark plugs to allow you to run more boost or fuel. No way you're gonna get 18hp from spark plugs, though. Maybe 2-3hp from switching to a more efficient (copper) plug instead of the stock platinums.
 
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