Putting performance spark plugs and leads in?

How much of a boost in performance can changing standard manufacturers spark plugs and leads to performance ones?Putting performance spark plugs and leads in?I don't think you would notice an improvement in performance at all. Alot of that stuff is more mental than actual real horsepower gains. If you want more pony's, spend your money on something proven. There is really no such thing as cheap horsepower.Putting performance spark plugs and leads in?on a stock engine you will not see any difference. that set up is for the richer mixtures and higher rpms available on an HO engine.