just so u know...i found in my engine, that having oem leads and ngk plugs dont really suit....my engine started choaking coz my oem leads were too thin for the plugs....so i had to get thicker leads to suit the plugs i'm running....so if u got oem plugs go oem leads....if u go aftermarket, get ngk...those leads only cost me 80 bucks....retails for around 110 i think