Be careful on that last plug. I had a friend strip a head on his Frontier trying to replace it. I have a huge shop at my disposal and neither myself or the techs that work there could figure it out. I spent the money on the half hour of labor and sent it to a local Nissan dealer. I figured it was better to spend $30 or so for the install than several thousand to repair the head. Since it only happens once every 45 to 50,000 miles, it was worth it in my opinion.