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not realy till u get the rest of a kick ass ignition pacage. i think teh plugs are only suposto add like 3 or 4 hp. like the same amount if u were to paint your engin black (beleave it or not, painting it black does add a bit of h.p. because black cools down faster)
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-89 Mustang LX
-99 lude
-2002 F-150 on 35's
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